When one parent passes on a dominant defective allele, what chance does the child have of manifesting the disorder?
A) A 100 percent chance
B) A 75 percent chance
C) A 50 percent chance
D) A 25 percent chance

Question

Quizplus · Accepted Answer

When a parent passes on a dominant defective allele, there is a 50 percent chance that the child will inherit the allele and therefore manifest the disorder. This is because the dominant allele will mask the presence of the normal allele in the heterozygous state, resulting in the expression of the disorder. If the parent was homozygous dominant for the allele, then the child would have a 100 percent chance of inheriting and manifesting the disorder.

When One Parent Passes on a Dominant Defective Allele, What