Topic 1.2
4. Colour vision deficiency is a recessive X-linked trait. A woman who has normal
vision and is not a carrier for vision deficiency marries a man who has colour
vision deficiency. What is the probability that they will have a child who has colour
vision deficiency? It may be useful to complete a Punnett square.
Probability of child with vision deficiency:

50%

Explanation:

i'm going to do a punnet square below. so the man has 1 x-chromosome and 1 y-chromosome but i'll capitalize his x because color deficiency is on the x chromosome. the woman is xx and both lower case because she is not a carrier

            woman

                x       x

X           Xx        Xx

y             xy         xy

answer; both surfaces of the membrane are nonpermeable