In mice black coat color is wild type and dominant Two mutan

In mice, black coat color is wild type and dominant. Two mutant mice with white coat color were crossed, and all the F1 had black coat color. How many genes are involved in controlling coat color? When the F1 are intercrossed, what are the expected phenotypic proportions of F2? A new mutant strain with white coat color was found. determine which gene the new mutation is located on? Be specific.

Solution

2

a)two genes are involved(one from each of the two mutant mice).

b)when F1 are intercrossed, the outcome is AB or a/b (2whites )This means the phenotypic proportion is 50%=>1/2

c)The new mutant strain will be found on the F2 offspring cross oftwi F1 produces a white F2.