Question

what is the probability that a female offspring of the cross that is shown above would have a recessive allele for duchenne muscular dystrophy disorder?
0 percent
25 percent
50 percent
100 percent

Explanation:

Step1: Analyze Female Genotypes

Female offspring get one X from each parent. The father's X is \( X^m \), mother's X can be \( X^M \) or \( X^m \). So female genotypes: \( X^M X^m \) and \( X^m X^m \). Both have the recessive \( X^m \) allele.

Step2: Calculate Probability

Total female genotypes: 2 (from Punnett square). Both have recessive allele. So probability \( \frac{2}{2} = 1 \) or 100%.

Answer:

100 percent