An autosomal dominant disease occurs when an individual is __________.
A) heterozygous for a dominant, disease-causing allele
B) codominant for a recessive, disease-causing allele
C) homozygous for a recessive, disease-causing allele
D) none of these

Question

Quizplus · Accepted Answer

An autosomal dominant disease occurs when an individual has only one copy of a dominant, disease-causing allele. This means the individual is heterozygous for the allele, as a dominant allele will mask the expression of a recessive allele. Codominance and homozygosity for a recessive allele would not result in an autosomal dominant disease.

An Autosomal Dominant Disease Occurs When an Individual Is __________