Tay-Sachs disease is a recessive genetic disorder. If only one gene is present, an individual is a carrier. What is the probability of two healthy Tay-Sachs carriers having a child that has the disease?

The probability of two healthy Tay-Sachs carriers having a child that has the disease will be %

Explanation:

It is given that Tay Sachs is a recessive disorder which means the genotype must both recessive allele.

Let the dominant normal allele be T and the recessive diseased allele be t

Genotype of a healthy Tay-Sachs carriers will be Tt

Tt * Tt

TT, Tt, Tt, tt

Only child with genotype tt will have Tay-Sachs disease

Hence the probability of two healthy Tay-Sachs carriers having a child that has the disease will be %

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