Question

In rabbits, the allele for black fur, B, is dominant over the allele for brown fur,

b. Calculate the probability of a homozygous dominant (BB) offspring resulting from a cross between two parents with the genotype Bb.
A 1
100
B 1
2
C 1
4
D 7
10

Answer 1

C. 1/4

2/4 - Bb
1/4 - bb
1/4 - Bb

Answer 2

The correct answer would be C. 1/4

The genotype of both the parents is heterozygous that is, Bb.

So, both of them will produce two types of gametes one of which would contain B and the other one would contain b.

The cross would produce offspring with three possible types of genotypes; BB, Bb, and bb in the ratio 1:2:1.

The phenotype ratio would be 3(black): 1 (brown).

Thus, the probability of a homozygous dominant (BB) would be 1 out of 4.