If a trait is X-linked recessive, who would express the trait?
A)females homozygous for the dominant allele and males hemizygous for the recessive allele
B)heterozygous females and males hemizygous for the dominant allele
C)females homozygous for the recessive allele and males hemizygous for the recessive allele
D)females homozygous for the recessive allele and males hemizygous for the dominant allele
E)the same proportions of females and males

Question

Quizplus · Accepted Answer

X-linked recessive traits are expressed in females only if they have two copies of the recessive allele (homozygous). In males, the recessive allele is expressed because they only have one X chromosome, so they are hemizygous. Therefore, females homozygous for the recessive allele and males hemizygous for the recessive allele would express the trait.

If a Trait Is X-Linked Recessive, Who Would Express the Trait