Below are three pedigrees. For each trait, consider whether it is or is not consistent w...

Below are three pedigrees. For each trait, consider whether it is or is not consistent with X-linked recessive in-heritance. In a sentence or two, indicate why or why not.

HINT: This problem involves potential X-linked recessive traits as analyzed in pedigrees. The key to its solution is to focus on hemizygosity, where an X-linked recessive allele is always expressed in males, but never passed from a father to his sons. Homozygous females, on the other hand, pass the trait to all sons, but not to their daughters unless the father is also affected.