A female hamster from a true-breeding big-eared strain was crossed to a male hamster from a true-breeding short-whiskered strain. Their offspring(F1) had normal ear size and whisker legnth. 1. One of the F1 males was crossed to a true-breeding big-eared, short-whiskered female. the following progeny were obtained. Are the loci regulating ear size and whisker lenght linked, and if so, what is the map distance between them? Normal ear, normal-whiskers 6 Big-eared, normal-whiskers 22 normal eared, short-whiskers 17 big-eared, shor-whiskers 5 2. Assume that the genes controlling ear size and whisker length are linked and have a map distance of 40cM. What would be the frequency of normal ear, short-whiskered hamsters among the progeny from a testcross of an F1 female? a. 0.4 b. 0.2 c. 0.3 d. 0.5 e. 0.1
A female hamster from a true-breeding big-eared strain was crossed to a male hamster from a true-breeding short-whiskered strain. Their offspring(F1) had normal ear size and whisker legnth.
1. One of the F1 males was crossed to a true-breeding big-eared, short-whiskered female. the following progeny were obtained. Are the loci regulating ear size and whisker lenght linked, and if so, what is the map distance between them?
Normal ear, normal-whiskers | 6 |
Big-eared, normal-whiskers | 22 |
normal eared, short-whiskers | 17 |
big-eared, shor-whiskers | 5 |
2. Assume that the genes controlling ear size and whisker length are linked and have a map distance of 40cM. What would be the frequency of normal ear, short-whiskered hamsters among the progeny from a testcross of an F1 female?
a. 0.4
b. 0.2
c. 0.3
d. 0.5
e. 0.1
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