Homework 4

 Ques 1

Assume for a moment that in dogs, curly hair (C) is dominant to straight hair (c). Suppose you breed a homozygous curly hair male with a straight hair female. If mating occurred between the F1 progeny, what would be the likely F2 phenotypic ratio of hair types? (HINT: Keep your generations straight!) 

Question 2 (10 points)

 In reference to the previous question, suppose you found an abandoned curly-haired dog. You don’t have access to fancy DNA instrumentation to run any fancy tests, so what might be an easier experiment you could perform to determine this dog’s genotype?

Question 3 (10 points)

 In a cross involving independently assorting loci, the cross BBYY x bbyy (assume “B” and “Y” are dominant to “b” and “y,” respectively) will yield all dihybrid offspring. When those offpspring are crossed, the result is usually a 9:3:3:1 phenotypic ratio.

But what if the locus “B” and “Y” did not sort independently (i.e., they were linked, at least partially)? It would mean “BY” and “by” are now more likely. How would this specifically affect the expected 9:3:3:1 ratio? To be more clear, which one of these numbers in the ratio (9, 3, 3, and/or 1) would be expected to decrease?

Question 3 options:

Question 4 (10 points)

 Perform the same starting cross you did in the previous question. But this time, perform a test cross (x bbyy) as your second cross. This would result in an expected ratio of 1:1:1:1. How would this ratio be expected to change if the two loci did not sort independently? 

Question 4 options:


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