In humans, the absence of sweat glands depends on a recessive gene linked to the floor. In the family, 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 with no sweat glands in this family?
X – absence of disease
X ° – disease
X ° Y
X ° X
||X °, Y
||X °, X
||X ° X °, X ° X, X ° Y, XY
Since the sign is linked to the X chromosome, and the son is sick, then the mother is the carrier of the disease (heterozygous). Genotypes of parents and offspring
Cleavage: sick daughters 25%, daughters of carriers 25%, sick sons 25%, healthy sons 25%
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