If two parents are carriers of albinism (an autosomal recessive trait), what is the chance that their fourth child will have a homozygous dominant genotype?
A) 50%
B) 0%
C) 25%
D) 100%
E) 75%

Question

Quizplus · Accepted Answer

Albinism is an autosomal recessive trait, meaning that an individual must inherit two recessive alleles (one from each parent) to express the condition. When both parents are carriers (heterozygous, having one dominant and one recessive allele), each child has a 25% chance of being homozygous dominant (not carrying the trait), a 50% chance of being a carrier like the parents (heterozygous), and a 25% chance of being homozygous recessive (having albinism). The birth order of the child does not affect these probabilities.

If Two Parents Are Carriers of Albinism (An Autosomal Recessive