In a cross between AaBb and AaBb, what proportion of the offspring would be expected to be A_bb?

(A_means AA Aa.)

a. 1/16

b. 316

c. 3/4

d. 3/8

e. 1/8

b. 3/16

Explanation:

The given parental genotypes: AaBb and AaBb.

To calculate the proportion of offspring with A_bb genotype, individual proportions can be calculated and the product rule can be applied.

The proportion of "A-" genotype in the cross = Aa x Aa = 1/4 AA: 1/2 Aa: 1/4 aa = 3/4 A - and 1/4 aa

The proportion of "bb" genotype in the cross = Bb x Bb = 1/2 BB: 1/2 Bb: 1/4 bb

Therefore, the proportion of the offspring expected to be A_bb = 3/4 A - x 1/4 bb = 3/4 x 1/4 = 3/16.