Sexlinked inheritance

A few characteristics of sex linked inheritance in birds are:

• Female birds get their Z chromosome only from their father.
• Female birds always express these sexlinked genes because they are not suppressed by genes on the W chromosome.
  Note that epistatic effects still can hide this expression.
• Female birds are hemizygous for the sexlinked genes.
• Male birds can show a dosage effect for dominant sex linked genes.