A male is neither homozygous nor heterozygous for his X-linked alleles; instead, he is always hemizygous.

Hemizygous

Relates to having only a single copy of a gene instead of the typical two; common in sex-linked traits where the gene is located on a sex chromosome.

X-linked Alleles

Alleles that are located on the X chromosome, which can result in different patterns of inheritance and expression in males and females due to the presence of a single X chromosome in males.

Homozygous

Having two identical alleles of a particular gene or genes, resulting in a specific genotype for that trait.