Red-green color blindness (c) is a recessive sex-linked trait. A colorblind male marries a normal female.
Their daughter is colorblind. Complete a Punnett square explaining how this is possible.
Sex linked traits can only be held on the X chromosomes, so males only need one while females need two. Since the daughter has it, it must mean the mother is a carrier and has one normal X chromosome and another with the recessive trait (c).
