In a family where parents have normal color vision, the son is color blind. The genes for normal color vision (D) and color blindness (d) are located on the X chromosome. Determine the genotypes of parents, son – color blind, gender and the probability of having children – carriers of the color blind gene. Make a scheme for solving the problem.
1) Parent genotypes: mother – ХDХd, father ХDY;
2) son’s genotype – color blind – XdY;
3) the probability of birth of carriers of the gene for color blindness (ХDХd) – 25%
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