Which statement about sex-linked disorders is correct?
A) A female who inherits an allele for a sex-linked disorder will develop Turner syndrome.
B) A female who inherits an allele for a sex-linked disorder will never express any symptoms.
C) A male who inherits an allele for a sex-linked disorder will always express the disorder.
D) A male who inherits an allele for a sex-linked disorder will express the disorder only if he has a matching allele for the disorder.

Question

Quizplus · Accepted Answer

Sex-linked disorders are often linked to genes on the X chromosome. Since males have only one X chromosome, inheriting an allele for a sex-linked disorder on their X chromosome means they will express the disorder, as they lack a second X chromosome that could potentially carry a normal allele to mask the effect of the disorder.

Which Statement About Sex-Linked Disorders Is Correct