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PS07Sol - 2(2 points Recall that female squirrel monkeys...

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Genetics 320 Problem Set Seven Solutions 1 (3 points) : Your are involved in determining the parents of an orphan, but because the candidate parents are dead (and cremated), no DNA tests are possible. However, you do have information on whether they are (red/green) colorblind (a) Suppose a male child is colorblind. Can you exclude candidate father who is not colorblind? NO. Why? Mother gives X to male offspring, not dad . Can you exclude candidate mother who is not colorblind? NO. Why? a heterozygote mother has normal vision, but can have colorblind sons. (b) Suppose a female child is colorblind. Can you exclude candidate father who is not color- blind? YES. Why? Colorblind fathers always given a colorblind X to their daugthers Can you exclude candidate mother who is not colorblind? NO. Why? a heterozygote mother has normal vision, but can have colorblind sons.
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Unformatted text preview: 2 (2 points) : Recall that female squirrel monkeys are trichromatic if they have both a red and green allele on their two X-chromosomes. Suppose the frequency of a red X is 0.4 and a green X is 0.6. What is the fraction of green-only females? . 6 × . 6 = 0 . 36 Red-only females? . 4 × . 4 = 0 . 16 Trichromatic females? 2 × . 4 × . 6 = 0 . 48 3 (5 points) : Plant species A has diploid chromosome number 2n = 10, species B has diploid number 2n = 20, and species C has number 2n = 30. What is the chromsome number for (a) An autotetraploid for species A ? 20 (b) An allotetraploid involving A and C? 40 (c) A gamete from an autotetraploid from species C? 30 (d) A trisomic individual from species C? 31 (e) A nullisomic individual from species A? 8 1...
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