Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Recessive conditions are clinically manifest only when an individual has two copies of the mutant allele. When just one copy of the mutant allele is present, an individual is a carrier of the mutation but does not develop the condition. When two carriers mate, each child has a 25% chance of being homozygous wild-type (unaffected); a 25% chance of being a homozygous mutant (affected); or a 50% chance of being heterozygous (unaffected carrier). (here genotype is Aa (heterozygous and unaffected).