Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) . Three children in a row were born with Tay-Sachs disease. What is the chance that a fourth child will have Tay-Sachs disease?

A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Tay-Sachs Disease

A genetic disorder characterized by the absence of an enzyme that helps break down fatty substances in the brain, leading to severe neurological impairment and early death.

Autosomal Recessive Disorder

An autosomal recessive disorder is a genetic condition that occurs only when an individual inherits two copies of an abnormal gene, one from each parent.

Probability

The measure of the likelihood that an event will occur, quantified as a number between 0 and 1.