The genes for color blindness are sex-linked and recessive. What is not true about the expression of color blindness?
A) It is infrequently seen in women.
B) Fathers can transmit sex-linked genes to their daughters.
C) It is frequently seen in women.
D) Fathers cannot transmit sex-linked genes to their sons.

Question

Quizplus · Accepted Answer

Color blindness is less common in women because it is a sex-linked recessive trait. Women have two X chromosomes, so they would need two copies of the recessive allele to express color blindness. Men, having only one X chromosome, express color blindness if they inherit one recessive allele. Therefore, it is not frequently seen in women.

The Genes for Color Blindness Are Sex-Linked and Recessive