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In mouse coat color, the allele G (for gray color) is dominant to black, which occurs...

In mouse coat color, the allele G (for gray color) is dominant to black, which occurs only with the double recessive gg. A recessive mutation homozygous at another site, kk, gives albino mice regardless of the G/g genotype. Allele K allows expression at the G/g locus. The F1 cross are all GgKk and are gray in color. Do the F2 cross and indicate the phenotype ratios.

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F1 generation is GgKk, heterozygus and gray in color. When two such F1 organisms are selfed , following are the gametes:

GK, Gk,gK,gk. Both parents produce these gametes. We use Punnet square to see the possible genotypes in the F2 generation.The phenotypic ratio is 9:3:4

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