Question

In laboratory mice, the normal gray (G) color is dominant over the white albino (g) color. A purebred albino
mouse and a purebred gray mouse were mated
a. give the genotypes of the parent: albino x gray
b. what is the predicted phenotype of the f1 generation?
c. what is the predicted ratio of phenotypes in the f2 generation?
D. phenotype ratio:

Answer 1

The first thing you want to do is determine the parents' genotypes. Because both parents are purebreds, you know that both their alleles are the same. So the normal grey mouse's genotype is GG and the albino mouse's genotype is gg.

The next thing you want to do is set up a Punnett Square with the parents' genotypes.



Filling in the Punnett square will give you the offsprings' genotypes. For the F2 cross, take two of the offspring from the first Punnett square and use them as parents in a second Punnett Square.

Hope that's helpful.

Answer 2

thank you so much! you explain it very clearly!

Answer 3

Thanks - glad to help.