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Ch. 13 - Meiosis
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All textbooksFreeman 8th EditionCh. 13 - MeiosisProblem 9

Chapter 13, Problem 9

Meiosis results in independent assortment of egg-derived and sperm-derived chromosomes. If 2š¯‘›=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, 2š¯‘›=38. What is the chance that a cat gamete contains only egg-derived chromosomes?

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Hi everyone. Here's our next question. How many combinations of maternal and paternal chromosomes are possible for gametes produced by a deployed organism with two and equal to 20. Also, what are the chances that a gammy produced by this organism will have only will only have maternal chromosomes. So we have an equation um, for the number of possible combinations of maternal and paternal chromosomes, which should be the number of possible combinations will equal to to the nth power where N. Is the number of chromosomes? Well, in this case we started with a deployed organism where two N. Is equal to 20. So we know that an must equal 10. So in the gametes where you have 10 chromosomes. So therefore the number of possible combinations in this case would be two to the 10th power, Which is 1024. So when we look at our answer choices, we know that the first number there has to be 1024. And when we look at our answer choices, we see that actually only one of them choice. See here has 1024 as the first number. So A B and D. Are all incorrect. So C must be our correct answer. And we'll just double check indeed, since the gamut having only maternal chromosomes Is just going to be uh occur be one possibility of all the possible combinations? The chance of that is one out of 1024. So how many combinations are possible for gametes of a deployed organism with two N equals 20 what are the chances the gamut will have only maternal chromosomes? That will B. Choice C. 1024 1 in 1024. See you in the next video?
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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=10ā€‰+ā€‰18=28 d. 4n=36 +20=56

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

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