Question

Albinism is inherited as an autosomal recessive. A couple, both with pigmentation, have a child with albinism. What is the probably of the next child being an albino girl?

Answer 1

Answer:

0.125 or 12.50%

Step-by-step explanation:

Since the couple already has a child with albinism and both parents have skin pigmentation, it can be concluded that both parents are heterozygous (A, a).

With that being said, there is a 1 in 4 chance, (a, a) genotype, that their next child has albinism, and there is a 1 in 2 chance that the child is a girl. Therefore, the probability of the next child being an albino girl is:

$P=\frac{1}{4}*\frac{1}{2}\\P=0.125=12.50\%$

The probability is 0.125 or 12.50%.