The constancy of the chromosome number from one cell generation to the next is maintained through Mitosis.
What is mitosis?A cell prepares for cell division by replicating its chromosomes, segregating them, and creating two identical nuclei during the mitotic phase. The cell's contents are often evenly divided into two daughter cells with identical genomes after mitosis.What is the mitotic process?A eukaryotic cell's nucleus divides in two during the process of mitosis, which is followed by the division of the parent cell into two daughter cells. The term "mitosis," which translates to "threads," refers to the chromosomes' appearance as threads when the cell gets ready to divide.What is the phases of the mitosis?prophaseprometaphasemetaphaseanaphasetelophase, and cytokinesis. What is the importance of mitosis?Multicellular creatures depend on mitosis to produce new cells for growth and to replace damaged or worn-out cells, such as skin cells. Mitosis serves as the main asexual reproductive mechanism for a large number of single-celled organisms.To learn more about mitosis visit:
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Professor basco is lecturing about the nervous system. he tells the class that the role of the pituitary gland is to make and release _____ into ______.
Answer:
The pituitary gland makes, stores and releases
hormones. The pituitary gland is located at the base of your brain below your hypothalamus
The main function of your pituitary gland is to produce and
release several hormones that help carry out important
bodily functions, including: Growth. Metabolism (how your
body transforms and manages the energy from the food
you eat). Reproduction.
In what direction, clockwise or counterclockwise, do the major circulation patterns rotate in the northern and southern hemispheres? why does each hemisphere have a different pattern?
The Coriolis effect makes storms swirl clockwise in the southern hemisphere and counterclockwise in the northern hemisphere. Because earth rotates on its axis circulating air is deflected towards the right in the northern hemisphere and towards the left in the southern hemisphere this effect called Coriolis effect.
Hurriances spin counterclockwise because the Coriolis effect. The equator rotates faster than other area of earth's surface and moving in a straight line on north to south axis will curve.
In southern hemisphere currents are deflected to the left. Storm system seem to rotate clockwise. This force is caused by the earth rotation and responsible for air being.
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The atp required for continuous muscle contraction during endurance activities comes from?
The ATP required for continuous muscle contraction during endurance activities comes from anaerobic respiration and oxidative phosphorylation.
What is anaerobic respiration?The process of breakdown of substrate glucose in the absence of oxygen is called anaerobic respiration. This process primarily takes in some unicellular organisms.
In humans, during endurance activities, a continuous supply of ATP is required. The ATP reserves in muscles are very small. Thus, there is a requirement for metabolic pathways to maintain continuous ATP supply and resynthesis.
These pathways are phosphocreatine breakdown and muscle glycogen breakdown which enable anaerobic substrate level phosphorylation and aerobic phosphorylation.
Therefore, the ATP required for continuous muscle contraction during endurance activities comes from anaerobic respiration and oxidative phosphorylation.
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Which type of lipids are the most abundant in the plasma membrane?
a. phospholipids
b. glycolipids
c. sterols
d. triacylglycerides
Phospholipids type of lipids are the most abundant in the plasma membrane.
What is phospholipids?Phospholipids are a subclass of lipids that have two hydrophobic "tails" made of fatty acids connected by an alcohol residue, one of which is a hydrophilic "head" containing a phosphate group. Omega-3 fatty acids EPA and DHA are frequently incorporated into the phospholipid molecule of marine phospholipids.Phospholipids are compound lipids made of alcohol, fatty acids, nitrogen base, and phosphoric acids. These intricate lipids, which also give the membranes their fluidity, make up the majority of the cell membrane.A class of polar lipids known as phospholipids (PL) is made up of two fatty acids, a glycerol unit, and a phosphate group that is esterified to an organic molecule (X) like choline, ethanolamine, inositol, etc.Esters of glycerol, fatty acids, phosphoric acid, and other alcohols make up phospholipids. Phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidylserine are the four most prevalent phospholipids.Learn more about phospholipid here:
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The inner cellular layer of trophoblast that remains intact inside the blastocyst is termed the?
The inner cellular layer of trophoblast that remains intact inside the blastocyst is termed Cytotrophoblast.
Cytotrophoblast is the inner layer of the trophoblast.
It is found on the outer side of the Blastocyst and inner side of the Syncytiotrophoblast.
Cytotrophoblast remains intact inside the blastocyst and is present as a inner cellular layer of trophoblast.
Cytotrophoblast produces several hormones like:
GnRHProgesteroneHCGEstrogenCytotrophoblast attaches the fetus that is growing to the uterine wall of the mother's body.
It plays an important role in embyro's transplantation.
Cytotrophoblast releases Proteinaceous enzymes between the endometrial cells allowing many finger-like projections.
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To believe that humans are ______ is to believe that humans act on the basis of reason.
To believe that humans are rational is to believe that humans act on the basis of reason.
Why are human beings rational?Because it has intelligence that gives it the ability to communicate through a structured language based on speech, increasing its power to communicate, to issue judgments and to develop methodologies capable of increasing the quality of life.
Rationality is a characteristic that differentiates humans from animals, being this focus for social development, for the development of technology and science, which impacts our lives so much through engineering, medicine, mathematics, etc.
Therefore, acting based on reason is a characteristic of human beings, which is based on their intelligence and ability to think analytically to adapt and improve society.
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What features are used to distinguish between true land plants and their algal ancestors?
Land plants are evolved from green algae.
Green algae called charophytes are coolest relatives of land plants.
It is believed that land plants are the most closely related to green algae, more specifically, a group of green algae referred to as charophyceans. Not only do both land plants and green algae produce chlorophyll a and b, but other evidence suggests that there is a relationship as well.
4 key traits that appear in nearly all land plants but are absent in the charophytes.
-Diploid embryos
- The ability to photosynthesize
-Apical meristem
-Walled spores produced in sporangia.
- Multicellular haploid and diploid generations
-Multicellular gametangia
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What molecule is both the starting compound and end result of the citric acid cycle?
Oxaloacetate is the starting compound and end result of the citric acid cycle.
Citric acid cycle:The primary energy-yielding metabolic route in cells is the tricarboxylic acid cycle, which provides the majority of the reduced coenzymes that will be oxidized by the electron transport chain to produce adenosine triphosphate (ATP). The pathway is occasionally referred to as the Krebs' cycle or the citric acid cycle after its discoverer, Sir Hans Krebs. Citric acid cycle occurs in the intracellular space or matrix of the mitochondria of eukaryotes.
The cycle serves as the primary mechanism for the interconversion of 4- and 5-carbon molecules in the cell, many of which originate from or are intermediates in the synthesis of amino acids, in addition to its function in energy-yielding metabolism and the oxidation of 2-carbon units. In the fasted state, the primary precursor for gluconeogenesis is oxaloacetate, a significant cycle intermediary.
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In a classic experiment conducted by Cannon and Washburn (1912), they monitored stomach contractions and found them to be related to _____.
In a classic experiment conducted by Cannon and Washburn (1912), they monitored stomach contractions and found them to be related to hunger.
What is stomach contraction?Stomach, intestines, or abdominal muscles can constrict during a stomach spasm. It may feel like a tiny muscle twitch or stomach cramps, depending on which area of your body is spasming and how severely.Food is moved through the digestive tract by a sequence of wave-like muscle contractions called peristalsis. The process begins in the esophagus, where powerful waves of smooth muscle transport balls of swallowed food to the stomach.Primarily, hunger is a biologically induced urge for food, which is necessary for survival. So, it is possible to think of hunger as a biological characteristic of humans that can be measured and predicted in terms of appetite and food consumption.Nerve cells located in the hypothalamus are what cause the feeling of hunger when they are active.
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Approximately what percent of these products are recycled? aluminum: % steel: % copper: %
The percentage of these products which are recycled include the following:
50% Aluminum25 % steel60% copper.What is Recycling?This is defined as the process in which different types of waste are converted into usable materials through different processes and techniques.
Recycling is important as it helps to reduce incidences of pollution and wastage thereby improving the quality of living for humans and other organisms present on Earth. The percentage of aluminum, steel and copper products being recycled can be seen above.
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When ______ reproduction occurs in a one-celled organism, the organism replicates its dna and splits into two genetically identical cells.
Answer:
Asexual
Explanation:
When asexual reproduction occurs in a one-celled organism, the organism replicates its DNA and splits into two genetically identical cells.
What is Reproduction?Reproduction may be defined as a biological process that involves the production of identical or dissimilar offspring by the successful fusion of two distinct parental gametes.
Asexual reproduction does not involve the mechanism of the successful fusion of two distinct parental gametes. Rather, it involves processes like budding, spore formation, binary fission, etc.
Binary fission is the mode of asexual reproduction that is mainly performed by single-celled organisms in order to replicate their DNA and split into two genetically identical cells.
Therefore, the type of reproduction that occurs in a one-celled organism, through which the organism replicates its DNA and splits into two genetically identical cells is known as asexual reproduction.
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Which procedure involves the direct visualization of the cervical canal and the uterine cavity and is performed to examine the endometrium?.
In the electron-transport chain in chloroplasts, _______energy electrons are taken from _______.
Answer:
In the electron-transport chain in chloroplasts, low energy electrons are taken from H20 (Water).
Which statement best summarizes the process represented by the model?
Chloroplast
Intermembrane B
A Space
Outer Membrane
Granum
(Stack of Thylakoids)
Thylakoid
Light
Dependent
Reactions
C
F
ENT
Calvin
Cycle
D
G
Inner Membrane
Stroma
(Fluid)
OA. Energy from sunlight moves through trophic levels.
B. Solar enerav is converted and stored in chemical bonds.
Answer: solar energy is converted and stored in chemical bonds.
Explanation:
What would you assume if you found rna transcripts of lactose-utilizing genes within e. coli?
Rna transcripts of lactose-utilizing genes within e. coli indicates the presence of lactose.
What is operon?
An operon is a collection of genes that all share a single promoter during transcription, found in bateria.There are regulatory DNA sequences in every operon, and these sequences serve as binding sites for regulatory proteins that either encourage or hinder transcription.Regulatory proteins frequently attach to tiny molecules, which can alter the protein's capacity to bind DNA and turn it on or off.Some operons are inducible, which means that a specific tiny molecule can activate them. Others can be turned off by a single molecule and are repressible, which means they are switched on by default.one example of operon is Lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is present and glucose is absent.Learn more about the Lac operon with the help of the given link:
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Biology: Choose the letter of the correct answer. Write the letters only.
(It’s abt the respiratory system btw)
(I’ve answered some, but I’m not sure, so can someone do?, ASAP!!)
Answer:
Greetings !
2. B, Lungs
3. B, Alveoli
4. C, Trachea
5. C, sinuses
6. A, Adenoids and tonsils
7. C, Pharynx
8. C, Larynx
9. B, Larynx
10. A, Bronchi and Bronchiole tubes
Hope it helps !
An example of sliding a joint is…
A Elbow joint
B Neck joint
C Knee Joint
D Wrist joint
An example of sliding joint is Wrist joint. Therefore, option (D) is correct.
Wrist joint is an example. The wrist joint allows sliding or gliding actions because the wrist bones move smoothly. Sliding improves hand dexterity, making it easier to do tasks like keyboard typing and managing tiny objects.
The radius, ulna, and hand carpals form the wrist joint, a complex articulation. The wrist joint's fluid gliding movement aids the hand's flexibility and nimbleness, making it important for many ordinary activities. Therefore, option (D) an example of sliding joint is Wrist joint.
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The ________ duct empties into the vestibule at the level of the second upper molar.
The parotid duct empties into the vestibule at the level of the second upper molar.
Around the back of your lower jaw is where the parotid gland is located. Saliva then passes via a tube known as the parotid duct. The duct's opening is where the saliva spills into your mouth. Different factors might cause the parotid duct to become clogged. The region may swell up as a result of this.
Each gland's front faces a lengthy excretory channel called the parotid duct, which emerges just beneath the masseter muscle. The duct enters the mouth by the buccinator muscle and opens on the inner cheek surface, typically next to the maxillary second tooth
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Given the parents aabbcc × aabbcc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?.
The correct answer is 3/4.
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If the water potential of a cell is -800kpa and solute potential of the same cell is 600 kpa then the water potential of that cell at equilibrium is?
The water potential of that cell at equilibrium is -200kpa.
Solution:
given that
Water potential [tex]\psi = -800kpa[/tex]
solute potential [tex]\psi _s = 600kpa[/tex]
we need to find water potential at equilibrium [tex]\psi _ w = ?[/tex]
We know that water potential = [tex]\psi = -\psi_s + \psi_w[/tex]
-800 = -600 + [tex]\psi _w[/tex]
[tex]\psi _w[/tex] = -200kpa
What is Water Potential?The potential energy of water per unit volume in comparison to pure water under reference conditions is known as water potential. The tendency of water to migrate from one place to another due to osmosis, gravity, mechanical pressure, and matrix effects like capillary action is measured by water potential (which is caused by surface tension).Understanding and computing water movement inside plants, animals, and soil have proven to be made easier by the concept of water potential. Greek letter is frequently used to symbolize water potential, which is normally stated in terms of potential energy per unit volume.Water potential combines a number of various water movement-related potential forces that may work in parallel or in opposition to one another. Numerous possible elements may be active at once in complicated biological systems.To learn more about water potential with the given link
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Part B
Many rain forest plants are prone to developing fungal infections on their leaves. Fungi can grow rapidly in moist environments, and a serious infection can kill plants. One rain forest plant species has a genetic variation that affects its leaf structure. The traits and the descriptions of the plant’s leaves are listed in the chart.
Description
Trait A: medium-tip leaves Leaves are narrower toward the tips, but don't come to a full point. Most of the water drains from the leaves.
Trait B: drip-tip leaves Leaves come to a sharp point, leading to thorough water drainage from the leaves.
Trait C: wide-tip leaves Water runs onto the leaves and tends to pool in pockets at the tips.
During natural selection, organisms with harmful traits are less likely to successfully reproduce than organisms with beneficial traits. Neutral traits don’t improve or hurt an organism’s chances for survival. So, they tend to persist in populations when environmental conditions are stable. If the environment changes, neutral traits could become harmful or beneficial depending on the situation.
In year 1, a population of rain forest plants has the following distribution: 50% have medium-tip leaves, 25% have wide-tip leaves, and 25% have drip-tip leaves. You will simulate three years of this population: year 1, year 5, and year 10. How will the trait distribution most likely change over this time?
The trait distribution most likely change over this time such that the plants with favorable traits, medium-tip leaves and drip-tip leaves will survive due to natural selection.
What is natural selection?Natural selection is the process by which organisms which are better suited to their environment survive whereas those not suited die off.
The organisms that are suited to their environment possess special features which enable them to adapt to changes in their environment.
Considering the plants in the rainforest with different leaf tips:
Trait A: medium-tip leavesTrait B: drip-tip leavesTrait C: wide-tip leavesSince fungi grow in moist environments, it can be seen that plants with Trait C will be least favored to survive, while plants with Trait B will be most favored to survive by natural selection.
Thus;
In year 1: the composition of plants is 50% have medium-tip leaves, 25% have wide-tip leaves, and 25% have drip-tip leaves.In year 5: the composition of plants is 50% have medium-tip leaves, 25% have wide-tip leaves, and 0 % have drip-tip leavesIn year 10: the composition of plants is 25% have medium-tip leaves, 75% have wide-tip leaves, and 0% have drip-tip leaves.In conclusion, plants with favorable traits will survive due to natural selection.
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What is a gene? describe the function, structure, and location within the cell.
A gene is a relatively small piece of genetic data with the capacity to encode proteins.
Type III genes are involved in cell-to-cell signaling, whereas type II genes are a complicated mixture of all three types. Type I genes often function as immunological responses or sensory receptors, while type III genes are involved in cell-to-cell signaling.
Function: A gene is a section of DNA that describes the arrangement of amino acids in a protein's polypeptide chain. The primary purpose of genes is to create an organism that resembles its parent organism.
Structure: With the exception of certain viruses, which have genes made of a chemically related substance called ribonucleic acid, most genes are made of deoxyribonucleic acid (DNA) (RNA). Two strands of nucleotides that spiral around one another to resemble a twisted ladder make up a DNA molecule.
Location: Inside cells, there are little spaghetti-like structures called chromosomes that contain the genes. There are many billions of cells in our body. All living organisms are made up of very tiny components called cells.
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That's the essay i wrote and i need answers to the 3 questions at the end
the 3 answers should be 500 words. pls i need them fast its the last lesson
First of all this experiment was so interesting to me. It was really fun checking up every week to see what changes occurred to the flat head nail I placed in my backyard. it was even more fun because I left my home a couple of times to another state during the month so every time I left I was so excited to come back and see the changes. I placed my flat head nail in my backyard and actually I have a reason for choosing to place a flat head pin instead of anything else, and that's because I knew that the flat head pin would get rusty because of the automatic water sprayer that's placed in our backyard. And I really wanted to try to place the rusty flat head pin in the Pepsi to see if it really works to remove the rust from the flat head pin. And guess what? it worked! I was so happy when it worked.
The environment that I placed my flat head pin in was damp most of the time because of the automatic water sprayer, although it's really hot now in Cairo to a point that the temperature reaches 113 degrees or even higher sometimes, especially in the afternoon. The place where I placed my flat head pin had many types of insects and birds. I saw ants, grasshoppers, cockroaches, mosquitoes, bees, worms, geckos, and flies. In the first week, not many changes happened to the flat head pin that I placed, the only change that happened is that I saw some ants and flies standing on the flat head pin, but they were mostly ants. I also noticed that there was some soil on the tip of the flat head pin and that was all for the first week. In the second week, things started to be a bit interesting. I started seeing some rust already on the tip of the flat head pin! and the soil started to get even more moisturized because my dad increased the amount of water a little because the weather was really dry and some of the grass started to turn brown and dry. luckily after my dad did that the grass turned bright green again.
At the beginning of week 3, I left my house for 3 days. While I was out of town there was a stand storm that hit our area. After I came back I checked on the flat head pin to make sure that it was still there and thankfully it was but, it was soaked in sand from the sand storm. at the end of the week, I checked again and there were a lot amount of ants trying to pull the flat head pin to somewhere else but they failed. and after the ants got off the flat head pin I noticed that the flat head pin was covered in rust I came closer to smell it and it smelt like rusty water. I left town again the fourth and final week and when I came back the flat head pin was completely covered with rust and I noticed something weird there were no more ants at all stepping or even near the flat head pin. Finally, I tried to place the flat head pin in Pepsi and I was overjoyed that it worked.
Now that I'm done with the experiment. The kind of changes that I can see in a larger human construct, such as parking lots is that the changes I would witness would be that over time with the heat snow rain, and change of climate would make the lines on the ground of the parking lot would fade and lose its color and the insects over the time would eat the bits of rocks in the parking lots.
1. Extrapolate what you've witnessed to larger human constructs, such as parking lots or shopping centers.
2. What kinds of changes can you expect to happen based on what you've witnessed with your experiment? Be sure to mention both the outgoing and incoming organisms.
3.Explain how the water cycle would be affected by large areas of concrete. Include information about run-off and pollution along with infiltration to ground water.
From what was seen so far, it is right to extrapolate that over time across he world, that environmental and climatic factors will have a degrading impact on the aesthetics of the architecture that have been created around human constructs such as shopping centers, parking lots, and even human dwellings.
What kinds of changes can you expect to happen based on what you've witnessed with your experiment?The kind of changes to be experienced is that aesthetics such as branding signs, paintings, signs and signages and other physical amenities are subject to wear and tear.
Animals both macroscopic and and microscopic contribute to these factors. For example, just like the in the experiment, ants are seen burrowing into soil and soft rock.
Humans, on the other hands naturally, wear away physical amenities with use over time.
How will the water cycle would be affected by large areas of concrete?The simple version of the water cycle is such that:
Rain fall to the earth,The water is absorbed on the soilThe water is evaporated from the soil into the atmosphereBy convection, the water fall back again onto the earth.Because concrete cannot absorb water as much as soil, the water that falls on the concrete runs off.
Bacterial which usually reside on natural soil don't exist on concrete, hence rather than breakdown waste into biodegradable components of the ecosystem, waster are washed off into water bodies as they are.
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What might explain the association between malignant tumors and chromosomal abnormalities?
Two prominent feature of cancer cells abnormal no of chromosomes and large scale structural rearrangements of chromosomes. The chromosome aberrations of chromosome and these are caused by genomic instabilities inherent to most cancers.
The chromosomal abnormalities which is change to child genetics material or DNA which the baby's development before birth. It is also causes miscarriage, disease or problems in development. It is known as aneuploidy, which is abnormal chromosome number due to an extra or missing chromosome.
Malignant tumors cells that can grow uncontrollably and spread locally. It is cancerous which is invade other sites. They also spread bloodstream and this is called metastasis.
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Which substance can be found in the bloodstream of a nonsmoker five hours after exposure to environmental tobacco smoke?
Nicotine found in the bloodstream of a nonsmoker five hours after exposure to environmental tobacco smoke
Chewing tobacco and other tobacco products contain the chemical nicotine. The most accurate approach to assess nicotine exposure in smokers and non-smokers exposed to ambient tobacco smoke is to measure cotinine in people's blood.
Within seconds after inhaling nicotine, it reaches the brain. Nicotine enhances the release of neurotransmitters, brain chemicals that help control mood and behavior.
Nicotine is a toxic and very addicting substance. It may result in an increase in heart rate, blood flow to the heart, blood pressure, and artery constriction (vessels that carry blood). In addition to contributing to artery wall hardening, nicotine may also increase the risk of a heart attack.
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In our bodies, glucose is broken down into carbon dioxide and water, much like a combustion reaction. How many grams of o2 are needed to fully react with 150g glucose?
160g of O₂ will be required to fully react with 150g of glucose when glucose is broken down in our bodies to produce carbon dioxide and water.
The breakdown of glucose in our bodies can be represented by the following reaction:
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)
As shown in the reaction, a mole of glucose reacts with 6 moles of oxygen.
To calculate the molecular mass:
1 mole of glucose (C₆H₁₂O₆) = (6x12) + (12x1) + (6x16) = 180g
6 moles of oxygen= 6x (2x16) = 192g
180g of glucose reacts with 192g of oxygen. So, to calculate the amount of oxygen required to fully react with 150g of glucose=
150 x 192/180 = 160g of oxygen.
Therefore, 160g of oxygen is required to fully react with 150g of glucose.
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A virus life cycle that involves the incorporation of the viral dna into the host chromosome is.
A virus life cycle that involves the incorporation of the viral DNA into the host chromosome is lysogenic cycle.
What is Lysogenic cycle?For viral entry and replication within cells, the lysogenic cycle is a complement to the lytic cycle. While both bacterial phages and animal viruses share the lytic cycle, animal viruses are more likely to exhibit the lysogenic cycle.
The stages of the lysogenic cycle are as follows:
The viral genome invades the cell The viral genome merges with the host cell's genome. The host cell's DNA When a cell divides, virus chromosomes are passed on to the daughter cells by the polymerase. The viral genome separates from the host cell's DNA and enters stage 2 of the lytic cycle at any time the virus is "activated".Learn more about Lysogenic cycle here:
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A site where pathogens can survive, multiply and serve as a continual source of infection is called a(n):_____.
A site where pathogens can survive , multiply and serve as a continual source of infection is called the reservoir. It is site where the infectious agent survives.
Reservoir is a host which allows the pathogen to live, and possibly grow and multiply. Humans , animals and environment can be reservior for microorganisms. Principal habitat that which pathogen lives , flourishes and able to multiply.
There are some examples such as humans are the reservior for the measles virus because it does not infect the other organisms. The place where microorganism, resides, thrives and reproduces. A carrier is a person with in-apparent infection who are capable of transmitting the pathogen to others.
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The correct sequence of sperm-transporting tubules that transport spermatozoa to the epididymis is the?
Correct sequence of sperm-transporting tubules that transport spermatozoa to the epididymis is Seminiferous Tubules---> Rete Testis---> Vasa Efferentia----> Epididymis
Spermatozoa is the sperm that is formed from a spermatid after Spermiogenesis. It is released into the lumen of seminiferous tubules.
Seminiferous Tubules is present in the testis of human body.
Sperm transporting tubules are:
Seminiferous TubulesRete testisVasa EfferentiaEpididymisThe sperm passes through the seminiferous tubule into Rete testis.
Rete testis is a network of tubules that form a link between seminiferous tubule and Vasa Efferentia.
Vasa Efferentia connects Rete testis to Epididymis. It makes a pathway for the sperm transportation.
Epididymis is the region where the transported sperm from Vasa Efferentia reach. It stores the sperm until they are functionally matured enough to carry out the fertilisation in the human female body.
Hence, the pathway is Seminiferous Tubules---> Rete Testis---> Vasa Efferentia----> Epididymis
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In the apple maggot fly, rhagoletis pomonella, the frequency of certain alleles increases steadily as one goes from north to south. this is an example of:_______
In the apple maggot fly, the frequency of certain alleles increases steadily as one goes from North to South. This is an example of: Sympatric speciation.
Sympatric speciation is observed when there are no physical barriers which prevent any members of a species from mating with another, and all members are in close contact to one another. A new species, possibly established on a distinct food source or trait seems to develop instinctively.
The example of apple maggot fly supports a model for sympatric speciation in progress. Hawthorn is the native host for the apple maggot fly in North America. However, in the mid-1800s, a new population developed on introduced, domesticated apple.
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