When sickle cell carrier marries a normal woman, the probability of them having a normal offspring is?

A. 0.75
B. 0.25
C. 0.5
D. .1

Correct Answer:

Option C – 0.5

Explanation

A sickle cell carrier (AS) and a normal woman (AA), when crossed will yield:

2 normal offsprings (AA) and 2 sickle cell carriers (AS).

Hence, the probability of a normal child = 24
= 0.5