Two breeders who maintain packs of Labrador retrievers decide to interbreed their genotypes to generate a greater diversity of phenotypes. One breeder's dogs are all pure-breeding yellow labs, while the other breeder's dogs are all pure-breeding brown labs. When they cross the yellow labs to the brown labs, all of the F1 offspring are black. When they cross the black F1 dogs together, they observe the following numbers of F2 phenotypes: 41 black, 16 brown, and 23 yellow.
1 point
What was the genotype of the initial pure-breeding yellow parents?
(b)/(b); (E)/(E)
B/B; e/e
B/B; E/E
(b)/(b); (e)/(e)
1 point
What was the genotype of the initial pure-breeding brown parents?
B/B; e/e
(B)/(B); (E)/(E)
b/b; e/e
b/b; E/E
1 point
Given the model of genetic control of coat color in Labradors shown in the illustration above, what is the expected number of F2 offspring with black coats?
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1 point
What is the expected number of F2 offspring with brown coats?
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