_____ are more likely to be carriers of X-linked traits, and _____ are more likely to express them.
A) Females; males
B) Females; females
C) Males; females
D) Males; males

Question

Quizplus · Accepted Answer

Females have two copies of the X chromosome, while males have one X and one Y chromosome. If a female has one X chromosome with a recessive allele for an X-linked trait, she may still have a normal phenotype due to the dominant allele on her other X chromosome. However, she can still pass on the recessive allele to her offspring, making her a carrier. Since males only have one X chromosome, if they inherit an X-linked recessive allele, they will express the trait because there is no dominant allele on their Y chromosome to mask the recessive allele.

_____ Are More Likely to Be Carriers of X-Linked Traits