In humans, the absence of sweat glands depends on a recessive sex-linked gene. In the family

In humans, the absence of sweat glands depends on a recessive sex-linked gene. In the family, the father and son have this anomaly, and the mother is healthy. 1) What is the probability (%) that the son will inherit the above trait from the father? 2) What is the probability (%) of the birth of a daughter in this family with the absence of sweat glands?

Solution.
Genes:
X – absence of disease
X ° – disease.
Since the trait is linked to the X chromosome, and the son is sick, it means that the mother is a carrier of the disease (heterozygote).
Splitting: sick daughters 25%, daughters of carriers 25%, sick sons 25%, healthy sons 25%.
1) 25
2) 25.



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