If a trait is X-linked dominant, 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)significantly more females than males

Question

Quizplus · Accepted Answer

In X-linked dominant inheritance, the dominant allele is located on the X chromosome. Females have two X chromosomes while males have one X chromosome and one Y chromosome. Therefore, females can be either homozygous dominant, heterozygous, or homozygous recessive for the trait, while males can only be hemizygous for the trait (either dominant or recessive depending on the allele present on their X chromosome). Therefore, the trait would be expressed in heterozygous females and males hemizygous for the dominant allele.

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