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.  

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