Which allele combination represents a male who has an x-linked recessive disorder? a: xry b: xry c: xrxr d: xrxr

The right answer is XrY.

Men, who have only one X chromosome, have the disease if they carry an abnormality on their only copy of the gene. The Y chromosome carries genes different from those carried by the X chromosome.

In genetics the uppercase letters designate a dominant allele and the lowercase letters designates a recessive allele, which lets us say that the answer is XrY.

atp is used for energy.