Question

Red -green color blindness is an x linked recessive disorder . Since normal vision is dominant, it is typically represented as x8. If a normal female wants to have children with a color blind now what is the probability of having a son who is colorblind? A daughter who is colorblind?A daughter who is a carrier ? In addition determine the genotypes of the two parents.

Answer 1

x y

x8 x8x x8y

x8 x8x x8y

The results of the punnet square show that:

They will not have a son who will be colour blind.

They will not have a daughter who is colour blind.

All the daughters born will be carriers of red- green colour blindness.

The genotype of the two parents will be:

Genotype of mother: x8,x8

Genotype of father: x, Y