Hybrids hide one expression of a trait that reappears when hybrids are self-crossed because As gametes form, paired sets of elementen separate, and when gametes connect during fertilization, the elementen combine once more.
The process of interbreeding individuals from genetically diverse populations to create a hybrid is known as genetic hybridization. Therefore, a genetic hybrid would have two unique alleles of the same gene. Because hybrid animals lack functional sex cells, they are unable to produce sperm or eggs, rendering them infertile. This is true because their parents' chromosomes from different species don't line up.
The merging of male and female gametes from the same organism is known as a self cross. Selfing is another name for it.
Some features exhibit a pattern whereby one allele expresses itself in the hybrid (dominant), while a second allele is present but hidden (recessive). A dominant allele will show up externally in the organism when it is combined with either another dominant allele or a recessive allele. Only when two recessive alleles are combined will a recessive allele become visible.
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What is the purpose of the G1 and G2 phases?
A. To grow a second cytoplasm before division.
B. They are growth phases to make the cell large enough to divide.
C. To make a copy of the cell's DNA.
D. They are growth phase to make the cell large enough to fight off infection.
Answer:
B.) They are growth phases to make the cell large enough to divide.
Explanation:
In G1, the cell grows in volume and number of organelles. After the DNA has replicated in the S phase, the cell continues to grow in G2. As such, the primary purpose of G1 and G2 is to prepare the cell for replication (division).
They are growth phases to make the cell large enough to divide. Therefore option B is correct.
The G1 (Gap 1) and G2 (Gap 2) phases are critical stages in the cell cycle. During G1, the cell grows and performs its normal functions, while in G2, it prepares for cell division.
The main purpose of these phases is to increase the cell's size and accumulate the necessary organelles and materials for successful cell division.
In G1, the cell ensures it has sufficient resources and energy before proceeding to the next phase, S (Synthesis), where it replicates its DNA.
After G2, the cell enters the final phase, M (Mitosis), where it divides into two daughter cells, each with a complete set of DNA and organelles.
Therefore option B They are growth phases to make the cell large enough to divide is correct.
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The total collection of alleles in a population at any one time makes up that population's?
The total collection of alleles in a population at any one time makes up that population's gene pool.
Gene Pool:A gene pool is a collection of all the genes (including alleles) found in a population or species that is capable of reproduction. A big gene pool has a wide range of genetic diversity and is more resilient to environmental stresses. This could be any population, such as pond frogs, woodland trees, or town residents.
In order to analyze the genetic variation of a population, the gene pool must be identified. A population has a higher likelihood of obtaining features that increase its biological fitness and the chance of survival the more genetically varied it is.
As a single species, humans can interbreed with one another anywhere on Earth. Therefore, each allele of the approximately 19,000–20,000 human genes in our genome makes up the human gene pool.
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Which of the four postulates of darwin's theory of evolution was not well established when on the origin of species was first published but is overwhelmingly supported today?
Some differences among individuals in a population are due to genetics and are heritable.
Despite without being aware of the existence of genes, Darwin could see that many characteristics are heritable—passed from parents to children. Mutations are structural alterations to the DNA molecules that make up genes. A significant source of genetic variation within a population is gene mutation.Variants that are inherited (or hereditary) are present in almost all of a person's cells throughout their lifetime and are passed from parent to kid. Due to their presence in the parent's egg or sperm cells, which are also known as germ cells, these variations are also known as germline variants.learn more about genetics here: https://brainly.com/question/25703686
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Glucagon and insulin have antagonistic effects. glucagon signaling results in an increase in blood glucose concentration. What do you expect is the result of insulin signaling?
Since Glucagon and insulin have antagonistic effects, if glucagon signals increase in blood glucose concentration, insulin would result in a decrease in blood glucose concentration.
Glucagon and insulin are both important hormones that play essential roles in regulating your blood glucose (sugar).
Both hormones come from your pancreas — alpha cells in your pancreas make and release glucagon, and beta cells in your pancreas make and release insulin.
The two hormones counterbalance each other to stabilize blood glucose. When blood glucose levels fall too low (low blood glucose), the pancreas pumps out more glucagon.
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Compare artificial and biological neural networks. what aspects of biological networks are not mimicked by artificial ones? what aspects are similar?
An antibiotic is given repeatedly to treat a recurrent ear infection. it worked initially but now is no longer effective. This indicates that the streptococcus bacterium?
An antibiotic is given repeatedly to treat a recurrent ear infection. it worked initially but now is no longer effective. This indicates that the streptococcus bacterium has become resistant to the antibiotic.
When bacteria adapt to the use of antibiotics, antibiotic resistance develops. Antibiotic resistance develops in bacteria, not in people or other animals. Both humans and animals are susceptible to infection from these germs, and their infections are more difficult to treat than those brought on by non-resistant bacteria.Gram-negative bacteria have a membrane covering their outer surface that shields them from their surroundings. This membrane can be used by these bacteria to block the entry of specific antibiotics. Using pumps built into their cell walls, bacteria eliminate antibiotics that enter the cell.If you don't feel better after receiving therapy with conventional antibiotics, you may have an illness that is resistant to such drugs.learn more about bacteria resistance here: https://brainly.com/question/8050491
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In the investigation of whether stretching before running prevents muscle cramps in calves, what would be the control group?
In the investigation of whether stretching before running prevents muscle cramps in calves, the control group would be a group of people who did not do stretching before running.
In a scientific experiment, a control group is a subset of participants who are not included in the main experiment and whose outcomes are unaffected by the independent variable under study. By isolating the effects of the independent variable on the experiment, this can help rule out other possible explanations for the findings of the experiment.Positive control groups, untreated control groups, and negative control groups are the three primary categories of control groups. Positive control group can demonstrate that the experiment is running as intended.Negative control groups are those where the experiment's settings are designed to produce a poor result. Untreated control group is merely observed to allow for the comparison of its outcomes of the treatment group.Thus this is an example of untreated control group where the control group is not given the treatment i.e., stretching before running so that it can be determined whether stretching before running prevents muscle cramps in calves.
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A woman has observed a bump on her external genitalia that over the course of a few weeks seemed to grow into a small cauliflower-like mass. It is not particularly painful, and she has had no other symptoms. This is likely due to Group of answer choices syphilis. chlamydia. human papillomavirus. herpes simplex virus.
A woman observed a bump on her external genitalia that over the course of a few weeks seemed to grow into a small cauliflower-like mass likely due to human papillomavirus.
What is the human papillomavirus?The human papillomavirus is a viral infection caused by different types of viruses and associated with a sexual mode of transmission.
The human papillomavirus generally causes mid to light infections but it must be properly treated in clinical settings.
In conclusion, a woman observed a bump on her external genitalia that over the course of a few weeks seemed to grow into a small cauliflower-like mass likely due to human papillomavirus.
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Which nerve is responsible for taste as well as salivation in the anterior oral cavity?
The chorda tympani gives a taste sensation. Salivation in response to oral food is based on visceral reflex arcs within the facial or glossopharyngeal nerve.
The chorda tympani gives taste sensation whereas glossopharyngeal nerve is responsible for mouth salivation.
The submandibular and sublingual salivary glands are innervated by preganglionic parasympathetic nerve fibers that are carried via the chorda tympani, which also gives taste sensation from the front 2/3 of the tongue. There are two cranial nerves that innervate the tongue and are used for taste: the facial nerve (cranial nerve VII) and the glossopharyngeal nerve (cranial nerve IX).
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What are possible advantages for self-pollination to have evolved in a flowering plant species? select all that apply.
All the options are correct: The advantages of self - pollination include;
the plant species can survive in areas where animal pollinators are absent, the plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing and less energy can be spent on attracting pollinator.What is pollination?Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilization and the production of seeds, most often by an animal or by wind.
There are two main types of pollination:
Self pollinationCross pollinationWhat is self pollination?Self-pollination is a form of pollination in which pollen from the same plant arrives at the stigma of a flower or at the ovule.
Advantages of self pollination;The plant species can survive in areas where animal pollinators are absent.The plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing.Less energy can be spent on attracting pollinator.Thus, the possible advantages for self-pollination to have evolved in a flowering plant species are; the plant species can survive in areas where animal pollinators are absent and less energy can be spent on attracting pollinator.
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The complete question is below:
What are possible advantages for self-pollination to have evolved in a flowering plant species? select all that apply.
-The plant species can survive in areas where animal pollinators are absent.
-The plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing.
-Less energy can be spent on attracting pollinator.
One of the most fundamental relationships in biology is between _________ and _________
One of the most fundamental relationships in biology is between structure and function.
Fundamental relationship between structure and function in biology:
The principle that structure determines function is fundamental to biology. In other words, how something is set up within an organism allows it to carry out its function (a living thing). Relationships between structure and function are produced by natural selection.
The term "structure" describes the way the (body) is put together, including the bones, muscles, tendons, and ligaments. Next, move on to the cellular level of the organ structure. The function is the way that (the body) operates.
For example, the fundamental units of all living things are cells. There are many billions of cells in the human body. They give the body structure, absorb nutrients from meals, turn those nutrients into energy, and perform certain tasks.
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After a signal binds to a signal receptor, the next step is transduction. Why is the signal transduction step necessary?.
The correct option is (C).
The more molecules that share the responsibility of passing the signal to activate the effector the more quickly and efficiently the message can spread.
What is Signal transduction?
The process by which a cell responds to substances outside the cell through signaling molecules found on the surface of and inside the cell.Three steps can be identified in cell signaling: A cell recognizes a signaling chemical coming from outside the cell, Transduction: The receptor protein is altered in some way when the signaling molecule attaches to it and finally, the signal causes a particular biological reaction.Because multicellular animals must coordinate the actions of hundreds to trillions of cells, signal transduction systems are particularly crucial in these systems. Cell-to-cell communication is made possible by a variety of methods that multicellular organisms have created.Learn more about the Signal transduction with the help of the given link:
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I understand that the quesion you are looking for is "After a signal binds to a signal receptor, the next step is transduction. Why is the signal transduction step necessary?
(A) The signal transduction pathway is not necessary since the signal can directly activate the effector.
(B) Transmission of the signal through multiple relay molecules before activating an effector is not efficient.
(C) The more molecules that share the responsibility of passing the signal to activate the effector the more quickly and efficiently the message can spread.
(D) The efficiency increases when less molecules share the responsibility of moving the signal from one molecule to the next to activate the effector."
Which chain of volcanic islands is not part of a convergent/subduction plate boundary?
Hawai'an volcanic islands
Hawai'an volcanic islands is not part of a convergent/subduction plate boundary.
What kind of plate boundary produces a sequence of volcanic islands?convergent boundaryAlong the convergent boundary, the new magma (molten rock) rises and may erupt violently to form volcanoes, frequently creating arcs of islands. Divergent plate boundaries are created when two plates are moving apart.Why do volcanic chains and convergent borders coexist?Subduction causes melting that is partially molten. Water loss in the plate causes partial melting. Mantle material melts as a result and rises to the surface.Which are the 4 types of convergent boundries?Divergent Plate Boundary. Convergent Plate Boundary. Transform Plate Boundary. Hotspot.To learn more about volcanic islands visit:
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Based on the punnett square, what is the phenotype of the offspring? hh hh tall short
The correct option is (C) Tall.
The offspring will have a Tall phenotype.
What is dominant and recessive trait?
The relationship between two genetic variants is referred to as dominant. Each gene has two alleles that an individual inherits from each parent. One allele of a gene, known as the dominant gene, will be expressed if the alleles are different. The impact of the other allele, known as the recessive one, is concealed. Even though the dominant trait only exists in one copy, it is always manifested when the connected allele is dominant. Only when both of the related alleles are recessive do recessive features manifest themselves.For instance, a tree with genotypes (Th) and (TT) will both be tall, while only a tree with genotype (hh) will be short.Learn more about the dominant and recessive trait with the help of the given link:
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I understand that the question you are looking for is "The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h). Based on the Punnett square, what is the phenotype of the offspring?
(a) HH
(b) Hh
(c) Tall
(d) Short"
After a stroke, what type of glial cell accumulates within the affected brain region?
Answer:
Treg cells accumulate after ischemic stroke (175). Astrocytes increase the level of IL-33 and CCL1 in response to stroke. IL-33 is thought to promote the proliferation of Treg cells because their numbers in the CNS after stroke is decreased in IL-33-deficient mice (175).
A factor that contributes to the increase in frequency of the vocal folds is the change in?
Mass per unit length.
A factor that contributes to the increase in frequency of the vocal folds is the change in mass per unit length.
What causes a voice's basic frequency to rise?The main cause of a rise in vocal intensity is an increase in subglottal pressure, which also causes a considerable increase in noise production and an increase in fundamental frequency. The fundamental frequency is markedly raised while noise production is only slightly decreased by increasing AP stiffness.How do vocal folds react to an increase in pitch?The change in is one element that contributes to the vocal folds increased frequency.The sound's quality is impacted by this. The folds can continue to be shorter and thicker for lower notes since they vibrate more slowly. The folds vibrate more swiftly for higher pitches.What three factors influence the pitch of your voice?The size and structure of your vocal folds and resonating cavities impact the quality of your voice, including its pitch, volume, and tone. Because of this, every person's voice sounds different.To learn more about vocal folds visit:
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Explain why glucose and ribose might be considered the two most important carbohydrates in biological systems.
Glucose and ribose might be considered the two most important carbohydrates in biological systems. Because the most significant substrate for cellular metabolism is glucose, and the ribose comprise of all the genetic material in an organism.
Carbohydrates carry out the body's method for transporting energy. Several biological systems, including the brain and blood cells, rely on glucose as an energy source.
Even though most ingested glucose is transformed into energy, part of it is converted into ribose and deoxyribose, which are crucial components of significant macromolecules, including RNA, DNA, and ATP. Additionally, glucose is needed to create the molecule NADPH, which is crucial for defence against oxidative stress and involves several other chemical processes throughout the body.
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Which ion species is a cell membrane (such as a neuron) most permeable to at rest (i. e. , resting membrane potential)?
The cell membrane is most permeable to potassium ions at the resting membrane potential.
What is resting membrane potential?The difference in the membrane potential between the inside of a cell and the outside of a cell is called resting membrane potential. This is usually 30 to 90 mV with the inside of the cell being more negative compared to the outside of the cell.
Because of the potential difference across the cell membrane, it is said to be polarized. In a condition where the membrane potential becomes more positive than the resting membrane potential, the membrane becomes depolarized. In a condition where membrane potential becomes more negative compared to the resting membrane potential, it becomes hyperpolarized.
All electrical signals used by the neurons are either due to depolarization or hyperpolarization from the resting membrane potential.
This resting membrane potential is determined by the movement of potassium ions across the membrane.
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A main outcome of ivan pavlov’s research is that a neutral stimulus can become a conditioned stimulus?
A main outcome of Pavlov’s research is that a neutral stimulus can become a conditioned stimulus only in the presence of an unconditioned stimulus that triggers an unlearned response.
What is Pavlov’s conditioning?
The classic conditioning -Pavlov conditioning- is an associative learning way. It is a behavior in which stimuli and responses are associated.
In Pavlov's conditioning, an unconditioned stimulus that usually induces a given response is associated with another conditioned stimulus -neutral- that does not provoke any response by itself.
Let us review a few concepts,
Unconditioned stimuli: Biologically significant stimuli that provoke an unlearned or reflex reaction. For example, food is an unconditioned stimulus.Conditioned stimuli: neutral, innocuous, or biologically not significant stimuli. Unconditioned Responses: Unlearned response that is triggered by reflex because of an unconditioned stimulus. An example is salivating.Conditioned Responses: These are provoked by conditioned stimuli. This refers to a learned response that reflects the association between conditioned and unconditioned stimuli.Initially, an unconditioned stimulus does not provoke any response, but after enough exposure to conditioned and unconditioned stimuli together, the simple presence of unconditioned stimuli induces conditioned responses. In this aspect, the subject has learned to predict or anticipate the unconditioned stimulus.
The classic example is the one in which a dog increases its salivation secretion as an unconditioned response when it sees food -the unconditioned stimulus-.
If the unconditionated stimulus is associated with the sound of a ring bell or a light -conditioned stimulus-, after a certain time, the dog will secrete saliva when hearing the ring bell soung or seeing the light.
If the conditioned stimulus is associated with a bad experience, there is an aversion response or conditioned fear.
The main outcome of Ivan Pavlov’s research is that a neutral stimulus can become a conditioned stimulus? Yes, but only in the presence of another unconditioned stimulus (food) that triggers an unlearned response (salivation).
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When a segment of chromosome 3 is removed and attaches to chromosome 5, what word do we use to describe what has happened?
When a segment of chromosome 3 is removed and attached to chromosome 5, we use the word exonucleolytic activity to describe what happened.
How important is the Exonucleolytic 3 → 5 activity of DNA polymerases?The 3' → 5' exonucleolytic activity of DNA polymerases is a self-correcting mechanism that allows them to check for the last nucleotide incorporated, correcting their own incorporation errors as they move along the DNA template.
What a chromosome?Chromosomes are structures formed by DNA, which in turn are composed of several genes and other nucleotides (DNA and RNA). They are found in all cells and each has specific functions.
With this information, we can conclude that we use the word exonucleolytic activity to describe what happened.
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ANSWER IF YOU SEE THIS ITS URGENTTT PLEASE ANSWER IF YOU KNOW THE ANSWER ITS A LEVEL BIOLOGY WILL MARK BRAINLIEST TO A GOOD ANSWER THAT EXPLAIN IT WELL!
Which of these chemical formulae represents a dissacharide? justify your answer
a.) C6H12O6
b.) C5H10O5
c.) C10H18O9
d.) C12H24O12
The chemical formula that represents a disaccharide is [tex]C_{12}H_{24}O_{12}[/tex]. The correct option is D.
What is a disaccharide?A disaccharide is a simple sugar that consists of 2 units of monosaccharides. The 2 monosaccharides are joined together by a glycosidic linkage.
The simplest monosaccharides have the chemical formula [tex]C_6H_{12}O_6[/tex]. Examples of these monosaccharides include glucose, fructose, and galactose.
This means that the ratio of C to H to O in monosaccharides is 1:2:1.
A disaccharide will have 2 units of monosaccharides. This means that the ratio of C to H to O would remain 1:2:1. The only chemical formula that fulfills this criterium is [tex]C_{12}H_{24}O_{12}[/tex].
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Before any cell divides it must first duplicate its entire _______________, which consist of all the cell's _____________ material. subject
Answer:
genome, which contains all of its DNA (or RNA in certain viruses), the DNA contains the information for cell processes.
Explanation:
Why is it important for teachers to implement all six levels of bloom's taxonomy in their lesson plans?
It is important that teachers implement all six levels of Bloom's taxonomy in their lesson plans because Bloom's Taxonomy of the Cognitive Domain is structured in levels of increasing complexity – from the simplest to the most complex – and that means that in order to acquire a new skill belonging to the next level, the student must have mastered and acquired the skill of the previous level.
What are the 6 levels and 3 domains of blooms taxonomy elaborate?Bloom's Taxonomy comprises three learning domains:
the cognitiveaffectiveand psychomotorand assigns to each of these domains a hierarchy that corresponds to different levels of learning. It's important to note that the different levels of thinking defined within each domain of the Taxonomy are hierarchical.
With this information, we can conclude that Bloom's taxonomy is a classification system used to define and distinguish different levels of human cognition
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All vertebrate embryos have _____ at some point during embryonic development, indicating a common evolutionary ancestor
All chordates chare four structures. One of the is the tail. All vertebrate embryos have _a tail__ at some point during embryonic development, indicating a common evolutionary ancestor.
What is the relationship between chordates?The evolutionary relationship between species is reflected in the similarities or differences in the patterns of embryonic development.
All chordates belong to the Chordata phylum, and share four main characteristics,
Notochord, which is a precursor of the dorsal spine.Nerv cord, dorsally located and parallel to the notochord.Pharyngeal cleftsTail
All chordates express these structures at some point in their lives, especially in the early stages of embryogenesis. Many of them can be lost with animal development and become vestigial structures.
The tail is a vestigial structure in many vertebrates.
Vestigial structures are those body parts, genetically determined, that have been retained during the evolution of the taxonomic group but have lost or reduced their original function.
Such vestigial structures were plenty functional in the ancestors of new species, but now are typically degenerate, stunted, or rudimentary, and tend to be much more variable than homologous non-vestigial parts
All vertebrates develop a tail at some point in their embryonic life, even humans. However, this structure lost its original function in several species, so after a period of embryogenesis, this tail disappears, and its forming vertebras get fussed with each other composing the coccyx.
In many animals, the function of the tail is to stabilize, equilibrate and mobilize. But in humans, for instance, the coccyx has lost this function but is still an area of muscle insertion.
The correct option is Tail.
All vertebrate embryos have _a tail_ at some point during embryonic development, indicating a common evolutionary ancestor.
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The arrival of a nerve impulse at the synaptic knob of a motor neuron causes synaptic vesicles to release _____ into the synaptic cleft.
A Final statement or concluding statement
The arrival of a nerve impulse at the synaptic knob of a motor neuron causes synaptic vesicles to release acetylcholine into the synaptic cleft.
What is released by synaptic knob?A neurotransmitter-containing membrane-enclosed vesicle fills the synaptic knob. The synaptic knob's arrival of an action potential opens [tex]Ca^{2+}[/tex] channels in the plasma membrane. Some of the vesicles undergo exocytosis in response to the [tex]Ca^{2+}[/tex] influx. The synaptic cleft receives the discharge of their neurotransmitter. The receptors on the postsynaptic membrane are where the neurotransmitter molecules bind. These receptors are ion channels that are ligand-gated.
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A woman is heterozygous for a rare dominant autosomal genetic disease, neurofibromatosis. she marries a normal man (homozygous recessive for neurofibromatosis), who has red-green color blindness, an x-linked recessive trait. they have children. if the woman is homozygous for normal vision, what is the chance they will have a daughter with color blindness?
No daughter (0%) will have the color blindness.
How to make a cross to find the genotype of the offspring?Genotype of woman with normal vision = XX
Genotype of man with color blindness = XYᵇ
Gametes formed from woman = X and X
Gametes formed from man = Xᵇ and Y
Crossing both the parents (Using Punnett square):
X X
Xᵇ XXᵇ XXᵇ
Y XY XY
Out of the four progeny 2 are boys and 2 are girls.
Sons do not carry the gene for color blindness.
Daughters are the carrier for the color blindness.
No daughter will have the color blindness. They are the carriers for the disorder.
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In a gene expression pattern called ______, the heterozygote has an intermediate phenotype between the homozygotes.
Answer:
Incomplete Dominance
What happens to the embryos as they journey along the conveyor belt? in brave new world
Decantation is the process of preparing embryos for the future. They receive vaccinations and immunizations against all diseases, and each embryo's caste is determined by the addition or exclusion of chemicals. Individuals are perfectly equipped for their state-determined fate once they have been decanted.
How are babies made in Brave New World?In Brave New World, artificial reproduction is used to build a "perfect" society. In a facility called "The Central London Hatching and Conditioning Center," babies are born in bottles. Once "hatched," the kids are brainwashed to accept certain moral principles that the book refers to as "hypnopedia."
The notion that society's well-being comes before an individual's is also instilled in the minds of the young. The youngsters are also told that they were made to accomplish their task and that there would be consequences if they did not do it, which goes along with this idea. Each child is placed into a specific container in order to have even more control over the children being created in the bottle. Each faction has a function within the civilization and is unable to deviate from that function.
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Firefighters should wear scba in hazardous atmospheres, because exposure to particulate contaminants such as _____ can cause lung cancer or cardiovascular disease.
Firefighters should wear scuba in hazardous atmospheres because exposure to particulate contaminants such as smoke can cause lung cancer or cardiovascular disease.
What are particulate contaminants?Particulate contaminants are macro or microscopic solid or liquid materials that float in the atmosphere. When these materials are present in an amount capable of causing a health hazard, they are described as pollutants.
Examples of particulate contaminants are smoke, dust, ashes, etc. They constitute health hazards when inhaled and bioaccumulated to a certain level in the body.
Some of the health hazards they constitute include cancer, cardiovascular problems, kidney problems, etc.
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The cns (central nervous system) is lacking in animals that have ________.
a. a complete gut
b. a closed circulatory system
c. radial symmetry
d. excitable membranes
The central nervous system is lacking in animals that have radial symmetry because radial symmetry has a shape of symmetry where distinguishable parts are organized in circular mold around the central p-ivot. Thus, option C is correct.
What is radial symmetry?Radial symmetry is a form of symmetry in which identical parts are arranged in circular pattern around the central axis.
Animal having radial symmetry can be divided into equal halves when cutting through the central axis.
Animals such as starfish, Hydra and coelenterata shows radial symmetry.
Therefore, the central nervous system is lacking in animals that have radial symmetry.Thus, option C is correct.
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