In mice the black allele B is dominant to the recessive whit

In mice, the black allele (B) is dominant to the recessive white allele (b). Two black mice of unknown genotype are mated to each other, resulting in 6 black and 1 white . What is the genotype of the mother?

Solution

Answer: genotype of the mother = Bb

Explanation:

The only possible genotype for parents are

P1: Bb (Black Mouse) X Bb (Black Mouse)

F1: BB (Black), Bb(Black), Bb(black), bb(Black)