: Males are more frequently affected because they are hemizygous (possessing only one X chromosome).
: Unaffected individuals cannot carry any alleles of a dominant trait. Pedigree Tactics Free Download
: Affected fathers will pass the trait to all of their daughters but none of their sons. Key Reasoning Tactics : Males are more frequently affected because they
: In X-linked inheritance, a single recessive allele is sufficient for a male to be affected. Pedigree Tactics Free Download