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Ch. 13 - Meiosis
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All textbooksFreeman 8th EditionCh. 13 - MeiosisProblem 13

Chapter 13, Problem 13

Select True or False for each statement. T/F Linked genes are always inherited together. T/F Genetic map distances measure the number of nucleotides between a pair of genes. T/F The farther apart genes are on a chromosome, the more likely there is to be a crossover between these genes during meiosis. T/F Crossing over occurs between genes on different homologs of a homologous chromosome pair.

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Welcome back. Here's our next question. Which of the following statements about crossing over is incorrect. So we recall that crossing over occurs during sexual reproduction and it occurs when we have our homologous pairs, one from each parent and we end up seeing that sort of the leg of one of these crosses over the other one. And these two pieces actually exchange places with the end result that you end up with two chromosomes like this where you have mostly from the blue parent here, but a little m peace of genes from the red parent. And then on the other side again, we have mostly jeans from the red parent with a little bit of the leg there. So for instance, if this is paternal and maternal genes, you're going to have mostly paternal genes on this chromosome but you've swapped over and you've added some maternal genes to that chromosome in the offspring. They now have a novel combination of genes because it's not just directly from the father, directly from the mother. So let's look at our answer choices with this in mind. Choice A says it is a process in which pairs of homologous chromosomes exchange genetic material. Well, this is true. The homologous chromosome pair is here and they've exchanged some genetic material, some jeans when they swapped this little piece of one of the chroma tickets. So this is true. We're looking for an incorrect statement. So that cannot be our answer choice B says it takes place during pro phase one of my aosis. Well, that is also true pro phases when these chromosomes pair up together and that's when crossing over occurs. So Choice B cannot be our answer. Choice E says it results in recombination of linked to genes. This is true linked. Genes are ones that are both found on the same chromosome. So perhaps you've got gene A up here and jean be down here. So, originally they were passed down together. When if the child inherited this chromosome from the mother, they got the mother's gina and the mother's jean B, they are linked because they're inherited together. However, when this portion with jean B was swapped, those two particular genes are no longer linked. So it results in the recombination of linked genes. That is true. So C is not our answer. Now, we're down to Choice D. Choice D says synopsis is the site of crossing over between homologous chromosomes. So, this little site right here. Well, that is false because that site is not called synopsis. That site is called the key asthma. So, Choice D. Is an incorrect statement about crossing over. See you in the next video
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Textbook Question

Meiosis results in independent assortment of egg-derived and sperm-derived chromosomes. If 2𝑛=4 for a given organism, and there is no crossing over, what is the chance that a gamete produced by this diploid organism will receive only sperm-derived chromosomes? In domestic cats, 2𝑛=38. What is the chance that a cat gamete contains only egg-derived chromosomes?

Textbook Question

A species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. (a) Design an experimental study to test this hypothesis.

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Textbook Question

A species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. (b) Why might the ability to withstand drying reduce any potential advantage of sexual reproduction in this rotifer species?

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