Sex-linked traits Transitional Reasoning Download PDF

Questions

1. 1.

   In humans, red-green color blindness is inherited as an X-linked recessive trait. A woman with normal vision whose father was color-blind marries a man with normal vision. If this couple is expecting fraternal twins consisting of one boy and one girl, what is the probability that the son will have red-green color blindness and the daughter will be a carrier?

   • A) 1/8
   • B) 1/4
   • C) 1/2
   • D) 1/16