Color blindness is a recessive X-linked trait.A normal couple has a color-blind child.Who else in this family is probably color blind?
A)the child's maternal grandfather
B)the child's maternal grandmother
C)the child's paternal grandfather
D)the child's paternal grandmother
E)the child's maternal grandmother or grandfather

Question

Quizplus · Accepted Answer

Since color blindness is a recessive X-linked trait, a color-blind child must have inherited the recessive allele from their mother, who must have been a carrier if she is not color-blind herself. The mother, in turn, must have inherited the recessive allele from her father, making the child's maternal grandfather the most likely to be color-blind.

Color Blindness Is a Recessive X-Linked Trait