Question

how is an affected male in a generation with a recessive trait disorder represented in a pedigree? xay xay xaya

Explanation:

In genetics, for a recessive trait disorder, males have one X and one Y chromosome. The recessive allele is represented with a lowercase letter. So an affected male (having the recessive trait) would have the genotype \(X^{a}Y\) where \(a\) represents the recessive allele. \(XAY\) would be a male with the dominant allele (unaffected if it's a recessive disorder), and \(XAYa\) is not a valid male genotype as males have one X and one Y (not two alleles on Y for this typical X - linked recessive trait representation).

Answer:

\(XaY\)