The absence of sweat glands in humans is a recessive trait linked to the X chromosome. A man who has no sweat glands married a woman whose family has never had the disease. What is the likelihood of having children with a similar anomaly?
Let’s designate the gene for the absence of sweat glands as X (a), its healthy allele as X (A). Father’s genotype X (a) Y, mother’s genotype X (A) X (A).
R: X (A) X (A) x X (a) Y – parents;
G: X (A) x X (a), Y – possible gametes;
F: X (A) X (a) – 50% healthy girl;
X (A) Y – 50% healthy boy.
The probability of having a sick child is 0%.
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