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Ch. 13 - Meiosis
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All textbooksFreeman 8th EditionCh. 13 - MeiosisProblem 7

Chapter 13, Problem 7

Norway rats have 42 chromosomes in their diploid cells. If such a cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II? a. 21 chromosomes and 21 double-helical DNA molecules b. 21 chromosomes and 42 double-helical DNA molecules c. 42 chromosomes and 42 double-helical DNA molecules d. 42 chromosomes and 84 double-helical DNA molecules

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Hello everyone. And today we have a very short video. So let's jump straight into it. We have that. The deployed number of chromosomes in chimpanzees is 48 will be the number of chromosomes in the cell after Mayo's is too. And we need to do some math to solve this problem. But it's very simple. First of all, remember that deployed can be represented by to end. So the deployed number of chromosomes in the chimpanzees is 48. However, remember that this is deployed. However, my aosis use the general process relies on the creation of gametes And these gametes are Hap Lloyd because they must be mixed with other gametes in order to create a new organism. That is 48 chromosomes in total. So since these gametes are going to be Hap Lloyd, they're going to be represented by N. So we need to find this number. So let's make this calculation up here. We have that to n Equals 48. So and must be equal to 48 divided by two. And it's going to be equal to 24. So here we have the end or the hotline number in the cell after meals is two is 24 chromosomes. So it's going to be answer choice A and that will be the final answer to our problem. I really hope this video helped you and I have to see you on the next one
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Textbook Question

Select True or False for each statement. T/F Sister chromatids are homologous chromosomes. T/F Non-sister chromatids are found on two different homologs. T/F Crossing over occurs between sister chromatids. T/F A chiasma forms between two of the four molecules of double-stranded DNA on duplicated homologous chromosomes.

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If one species (2n=10) crosses with another species (2n=18), producing an allopolyploid offspring, what is the ploidy of the offspring? a. 2n=10 b. 2n=18 c. 2n=10 + 18=28 d. 4n=36 +20=56

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Triploid (3n) watermelons, which are seedless, are produced by crossing a tetraploid (4n) strain with a diploid (2n) plant. Explain why this mating produces a triploid individual.

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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?

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