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5 - and Zz genotypes have long stems and zz genotypes have...

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Paull BIO 212 Problem Set #5 (15 pts) Due on March 3/4 Handout #5: Meiosis/monohybrid cross 1. Imagine a diploid cell with 4 different chromosomes, A, B, C and D. There are 2 different types of homologs for each chromosome, A and a, B and b, C and c, D and d. a. (1 pt) If the diploid cell undergoes meiosis, how many possible genotypes could there be after meiosis II (considering independent segregation only, not crossovers) ? b. (3 pts) List the genotypes of all these cells from part a : c. (1 pt) If the A,B, C, and D homologs came from Mom, and a, b, c, and d came from Dad, is it possible that a gamete created during meiosis could contain DNA that originated from only one parent? What is the probability of this occurrence? e. (1 pts) If the original diploid cell had two copies of the same chromosome A (instead of having two different forms, A and a), how many different genotypes could there be after meiosis I?
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2. Assume that, for a particular plant, stem length is determined by the Z locus such that ZZ
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Unformatted text preview: and Zz genotypes have long stems and zz genotypes have short stems. You have a long-stemmed plant and want to know the genotype so you cross it with a short stemmed plant. About half of the plants from this cross have long stems and the other half have short stems. a. (2 pts) From this you conclude that the genotype of the original long-stemmed plant was: b. (3 pts) If you did a self-cross with the original long-stemmed plant, what would these look like and in what ratios? What would the genotypes be? c. (1 pt) Why is a test cross always done with a recessive strain/genotype? 3. part a (1 pt) Imagine that you have found a very unusual cat with curled ears. When you mate this cat with a normal cat you get 2 cats with normal ears and 2 cats with curled ears. This result indicates that the curled ear phenotype is likely to be: a. recessive b. dominant c. it could be either dominant or recessive part b. (2 pts) Write out all the genotypes for the answer in part a:...
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