Question

which allele combination represents a male who has an x - linked recessive disorder?
○ x^ry
○ x^ry
○ x^rx^r
○ x^rx^r

Explanation:

Males have XY sex - chromosomes. For an X - linked recessive disorder, the allele on the X - chromosome must be recessive. So, the combination is \(X^rY\) where \(X^r\) is the recessive allele on the X - chromosome.

Answer:

A. \(X^rY\)