In birds, males have two copies of the Z chromosome (ZZ) and females have a Z chromosome and a W chromosome (ZW). Females transm
it a Z chromosome to their sons and a W chromosome to their daughters, while males transmit a Z chromosome to both their sons and their daughters. Based on this information, which statement is true? A) A mutant phenotype due to a recessive Z-linked allele will be more common in males than in females. B) Males are hemizygous for Z-linked genes. C) Females who receive one Z-linked mutation are heterozygous carriers. D) A recessive Z-linked trait can skip a generation if it passes through a carrier (phenotypically normal) son. E) All of the above
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