Graded for correctness: In humans, the ability to digest lactose beyond childhood is determined by a single gene on chromosome 1. L denotes the allele that gives the ability to digest lactose and l denotes the inability to digest lactose. On chromosome 3 is the gene for widows peak. A denotes the allele for no widows peak and a denotes a widows peak. A woman volunteers to be a participant in a genetic research study. Her genotype is LlAa. A doctor harvests a single egg from her body. The genotype of her egg is LA. How did her chromosomes line up at the metaphase plate during meiosis
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Answer:
Metaphase I:
Homologous chromosomes are placed in the equatorial planeChromosomes carrying the dominant alleles, L and A, face one of the polesThe homologous chromosomes, carrying the recessive alleles, l and a, face the opposite pole.Metaphase II:
Chromosomes carrying the dominant alleles, L and A, are placed in the equatorial planeOne of the chromatid sisters of each chromosome faces one of the polesThe other chromatid sisters of each chromosome face the opposite pole.You will find the image in the attached files.
Explanation:
During metaphase I, homologous pairs migrate to the equatorial plane. They randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. This random order in the equatorial plane is what introduces variation into the gametes. It is almost impossible that two gametes resulting from meiosis will get the same genetic charge.
During metaphase II, fibers of the spindle apparatus take chromosomes toward the equatorial cell plane, where they line up. Sister chromatids are holden together until they reach the Anaphase, during which specialized enzymes break the bonds between chromatids and separate them. Each chromatid migrates to one of the poles. In telophase, the new chromosomes are already in the corresponding poles, and the nuclear membrane forms again. Finally, cytokinesis occurs.
In this example, we will assume no crossing-over in the prophase. I will propose the two metaphase stages.
Metaphase I: Pole 1
Chromosome 1 ---------L---- -----------A--------- Chromosome 3
----------L---- -----------A---------
Equatorial plane.....................................................................................................
Chromosome 1 ---------l---- -----------a--------- Chromosome 3
---------l---- -----------a---------
Pole 2
In this scheme of Metaphase I, homologous chromosomes are already aligned in the equatorial plane. Each homologous chromosome is facing a pole. So, in the superior part of the scheme, we have chromosomes 1 and 2 carrying the dominant alleles L and A. Both chromosomes are facing pole 1. Then, we can recognize the equatorial plane, and on the other side, we find the homologous chromosomes 1 and 2, facing pole 2, and carrying the recessive alleles, l and a.
During anaphase I, homologous chromosomes will separate and migrate to different poles. In this example, we are interested in chromosomes carrying the dominant alleles that migrate to pole 1. LL and AA.
Metaphase II: Pole 1
Chromatid 1 ---------L---- -----------A-------- Chromatid 3
Equatorial plane.....................................................................................................
Chromatid 1 ----------L---- -----------A--------- Chromatid 3
Pole 2
During metaphase II, each chromatid sister carrying the dominant alleles faces a different pole. During anaphase II they separate and migrate again.
The total result of meiosis in this particular cell is the formation of 4 haploid cells -gametes-: LA, LA, la, la
Related Questions
Please help...Will mark brainiest....It is due and I need help
Answers
Answer:
Explanation:
For the 1st one with the Cheetah: It would be a long tail because it helps them balance when they turn. Sinch Cheetahs move extremely quickly they need a balance to ensure they don't topple over when they turn, this tail provides this balance.
For the 2nd one with the bear: Thick coats on a bare will help provide warmth whenever they go to hybernate. Thin fur would leave room for freezing and wouldn't be able to help them maintain the proper body temperature.
The 3rd one with the clownfish: A round tail provides a bigger boost when swimming since it is able to push more water. A forked tail would create a gap when they swim so they would have to expend more energy than with a round tail.
The 4th one with the Finch: Since grubs live underground a thinner beak would be able to dig them out and stab them faster. This allows them to reach farther and get more food.
Answer:
D AZ FCSDF SDF F
Explanation:
just seeing how this works don't mind me
How do toothed whales produce echolocating sounds?
Answers
Answer:
Toothed whales (including dolphins) have developed a remarkable sensory ability used for locating food and for navigation underwater called echolocation. Toothed whales produce a variety of sounds by moving air between air-spaces or sinuses in the head.
Explanation:
Answer:
Toothed whales can direct sound by bouncing it off air sacs in their nose and possibly by using face muscles to alter the shape of the melon.
Explanation:
Which of the following statements is NOT part of the cell theory?
A. Cells are made of molecules
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Answer:
A
Explanation:
Where can proteins be found when part of a plasma membrane?
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Answer:
Peripheral membrane proteins are found on the outside and inside surfaces of membranes, attached either to integral proteins or to phospholipids. Unlike integral membrane proteins, peripheral membrane proteins do not stick into the hydrophobic core of the membrane, and they tend to be more loosely attached.
Explanation:
What factors limit population growth?
Answers
This shows cardiac muscle. This type of muscle is *
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Answer:
Involuntary
Explanation:
Hope that helps ;)
Answer:
Involuntary
Explanation:
Cardiac muscle is also an involuntary muscle, found only in the heart. The cardiac muscle fibers all contract together, generating enough force to push blood throughout the body.
What causes evolution to occur in organisms? Explain the process of evolution and how it is driven by various factors.
Answers
Answer:
Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through natural selection or randomly through genetic drift. This occurs because organisms with advantageous traits pass on more copies of these heritable traits to the next generation
Explanation:
If not then sorry I tried my best to help out.
GOOD LUCK!!!!
Why might parents who don't show the trait of albinism have children who do?
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Answer:
It’s just how it works
Explanation:
Ap3x
Which kingdoms contain both autotrophs and heterotrophs?
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Answer:
The kingdom Protista contain both autotrophs and heterotrophs.
Describe what it means when we say that DNA replication is semi-conservative:
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Answer: Semi-conservative replication means that during DNA replication, the two strands of nucleotides separate. Both strands then form the template for free nucleotides to bind to to create the two identical daughter strands. Hence each daughter strand has half of the DNA from the original strand and half newly-formed DNA. brainliest
Explanation:
The Tibetans and Han Chinese share several genetic traits and DNA. However, the EPAS1 gene, which increases the ability of red blood cells to carry oxygen even in low oxygen environments, is only commonly found in the Tibetan population that live in higher elevations. Explain why this gene is only common in Tibetan populations from the perspective of competitive advantage and natural selection. Write your answer in three to five sentences.(4 points)
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Answer:
When in higher altitudes, ticker blond has a tendency to cause problems like heart attack's, however the Tibetans have adapted to the high altitudes and this has made their blood thinner in order to keep them safe in the altitudes, including that it has low oxygen rates in the altitude therefore providing more oxygen in the bloods cells.
Explanation:
:D It's not my best explanation but I hope this helps <3.
Owing to the fact that ability of the redblood cells to to carry oxygen even in low oxygen environments is neccessary at high elevations, the Tibetan population that live in higher elevations are found to possess the EPAS1 gene.
What is natural selection?The term natural selection refers to the fact that organisms that are better adapted to their habitat will live longer and reproduce. Now we have to note that owing to the elevation at which they live, the people that possess this EPAS1 gene can cope with oxygen stress that could likely occur at a high altitude.
As such, the Tibetan population that live in higher elevations are found to possess the EPAS1 gene.
Learn more about natural selection: https://brainly.com/question/26690612
Why is ecology important?
Answers
When a plant doesn't have enough water, it will wilt and _____ .
A) the amount of carbon dioxide will increase
B) the amount of carbon dioxide will decrease.
C) the amount of oxygen will increase.
D) the rate of photosynthesis will increase
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Answer:
The amount of Carbon Dioxide will increase.
Explanation:
Answer:
When a plant doesn't have enough water, it will wilt and the amount of carbon dioxide will decrease.
Explanation:
You're welcome!
Organisms can be classified in the same species by morphology and _____.
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PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!!PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!
Answers
Answer:
The hood island tortoise.
Explanation:
It has the longest neck (adaptation), and will be able to reach food that is higher up, like a vine growing on a tree.
It is also because of it's saddle-shaped shell, that will make it easier to stretch.
Hope this helps! I don't beg, but if you liked my answer, please consider me for brainliest :)
What form of electromagnetic radiation do microwaves use?
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Answer:
Microwave ovens work by using 2.45 GHz frequency electromagnetic waves know as microwaves to heat the water in food.
a microwave oven uses microwaves to heat food. Microwaves are a type of wave that are sandwiched between radio waves and infrared radiation on the electromagnetic spectrum.
Explanation:
- Eijiro <3
A command economy features:?
Answers
Answer:
A command economy is a system where the government, rather than the free market, determines what goods should be produced, how much should be produced, and the price at which the goods are offered for sale. It also determines investments and incomes. The command economy is a key feature of any communist society.
Explanation:
What process adds carbon dioxide to the air
teven cycle
water evele
respation
photosynthesis
Answers
Answer:
Respation
Explanation:
Though it is spelled respiration.
why does a male body produce more testosterone than a female's body
Answers
Answer:
Levels depend on a person's age, sex, and health. Males usually have much higher levels of testosterone in their body than females
Explanation:
As the metabolism of testosterone in males is more pronounced, the daily production is about 20 times greater in men. Females are also more sensitive to the hormone
The government wants to set new regulations that prohibit chlorofluorocarbons (CFCs) use in aerosol sprays and refrigerants. How will this act help with the sustainability of our environment?
Answers
Answer:
The new regulation will help reduce the amount of green house gases available in the atmosphere thereby saving our environment from the Green house effect
Explanation:
Chlorofluorocarbons are examples of greenhouse gases which contribute to the Green house effect been experienced in our environment, by destroying the earths' Ozone layer
If the Government sets a new regulation that prohibit its use in sprays and refrigerants it will help reduce the amount of green house gases available in the atmosphere thereby saving our environment from the Green house effect
Answer:
that act will help the sustainability of out environment because : C. It will slow down the degradation of the ozone layer
The usage of CFC will crate chlorine atoms that catalyze ozone degradation. By prohibiting this product, Government will slow down Ozone's degradation
hope this helps
which are examples of steroids? A. testosterone and trans fats B. cholesterol and phospholipids C. cholesterol and vitamin D D. estrogen and phospholipids
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Answer:
A
Explanation:
because it really is suppose. to make u more stronger tougher and high testosterone.
Each kidney contains ____ of nephrons. Each is _____ but extremely _____, much like a neuron(but shorter).
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Answer:
One million.
Explanation:
Each kidney contains about one million of nephrons. The nephron is the structural and functional unit of the kidney means that our kidney is made up of nephrons. The main function of nephron is to produces urine in the process of removing waste, toxic and excess substances from the blood. kidney is responsible for the filtration of blood by removing all the waste materials and taken these waste materials to the excretory organs in order to remove from the body.
What is the difference between the original strand of DNA and the mutated
strand?
(HELPP)
Answers
Answer:
An original section of dna has the base sequence agcgttaccgt. A mutation in this dna strand results in the base sequence aggcgttaccgt. This change represents a frameshift mutation. It is a genetic mutation caused by indels (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three.
Explanation:
Answer:
one is a mutant
Explanation:
Does anyone know why Mt. Vesuvius erupted? Was it natural or human caused?
Answers
Answer:
Human caused i think?
Explanation:
Pls helpppp and thank youuuu
Answers
4. The diagram below represents one possible immune response that can occur in the human body.
**The structures that are part of the immune system are represented by
A, only
A and C, only
B and C, only
A, B, and C
5. Explain your answer to the previous question
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Answer:
A and C only
Explanation:
I'm sorry I don't know how to explain it but trust me its A and C only.
What are some ways that natural selection equips organisms for survival in their environment?
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Answer:
Well organisms who have traits that are beneficial to them and would make them live long enough to usually reproduce, it would become an adaptive trait. That organism who has that trait will most likely live the longest and reproducing which will pass down their traits. Other same type of organisms who don’t have that trait will most likely die quicker then those who do and they won’t be able to pass on their genes which will lead to the natrual selection being very few of those types. If your born with a non useful trait, you jsut pass it down, you can’t just have the ones that benefit you unless yoru parents have it. This is why at the ”end” there will be more with useful traits and barley any with non.
Explain the relationship between the nucleus, gene,DNA,chromosome, and cell
Answers
Spong father is a heterozygous squarepants and her mother is a roundpants, what are
her parents' possible genotypes?
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Answer:
(a) If SpongeGerdy's father is a heterozygous squarepants and her mother is a ... possible genotypes that would result to help you determine Gerdy's genotype. ... sponge. She knows that they have a 50% chance of having a little roundpants, ... be blue (a recessive trait) like SpongeSusie and many members of her family.
Explanation:
True or False:Sunlight and the force of gravity are essential components to the water cycle
A. True
B.False