gibbonch gibbonch

24-04-2024
Biology

Answered

In humans, Tay-Sachs disease is caused by an autosomal gene with the disease allele (t) recessive to the non-
disease allele (7). Two parents are heterozygous for Tay-Sachs disease; one parent has XY sex chromosomes
and the other has XX sex chromosomes.
A. If these two parents have two children, what is the probability that only the older child (and not the younger)
will have Tay-Sachs disease?
B. What is the total probability that the older child will have Tay-Sachs disease and have XX sex chromosomes?

Answer :

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