Ella is a normal XX girl who is red-green colorblind.She is pregnant and the father is Terrick who has normal color vision.What is the probability that - if they have a daughter - the daughter will be red-green colorblind?
A) 0%
B) 25%
C) 50%
D) 100%
E) impossible to tell with the information provided

Question

Quizplus · Accepted Answer

Red-green colorblindness is an X-linked recessive trait. Ella, being colorblind, has two X chromosomes with the colorblind allele (XcXc). Terrick, having normal vision, has one normal X chromosome and one Y chromosome (XY). A daughter would inherit one X chromosome from each parent, so she would receive one Xc from Ella and one normal X from Terrick, making her a carrier (XcX) but not colorblind.

Ella Is a Normal XX Girl Who Is Red-Green Colorblind