You asked: What pedigree only affects males?

In a Y-linked disorder, only males can be affected. If the father is affected all sons will be affected.

Who is affected in a pedigree?

An individual in the pedigree will be affected (express the phenotype associated with a trait) when the individual carries at least one dominant allele of a dominant trait, or two recessive alleles of a recessive a trait. generations are not carriers.

Can males be carriers in pedigrees?

A male never passes an x-linked trait to a son. An unaffected male cannot be a carrier and cannot transmit a disease allele to any child.

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