26. Colorblindness is a recessive, X-linked trait. In marriages between a man who is colorblind, and a woman who is a carrier, what percentage of the children can be expected to be daughters who are color blind?
25%
c. 0%
b. 100%
d. 50%
a.

A). 25%

Explanation:

XX because she is female. Since she is not color blind one of the pair has to be XC. Since she is a carrier of color blindness she has to have the recessive gene as well, so the other has to be Xc.

When a color blind father and a mother who carries the color blind gene have children, there is a 50% chance that their sons will be color blind. Their daughters, however, will have a 50% chance of being color blind and 100% chance of being carriers of the gene.

A colour blind boy can't receive a colour blind 'gene' from his father, even if his father is colour blind, because his father can only pass an X chromosome to his daughters. ... Blue/yellow colour blindness affects both men and women equally, because it is carried on a non-sex chromosome.

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