Tay-Sachs is a recessive genetic disease in humans. If one parent is homozygous normal and the other is a carrier (heterozygous), what are the chances that their child will have this disease?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

Since Tay-Sachs disease is recessive, a child must inherit two copies of the defective gene to exhibit the disease. If one parent is homozygous normal (not carrying the disease allele) and the other is a carrier (heterozygous, with one normal and one disease allele), all children will receive one normal allele from the homozygous parent, preventing the disease.

Tay-Sachs Is a Recessive Genetic Disease in Humans