What is the probability of manifestation of a recessive trait in the phenotype in the offspring

What is the probability of manifestation of a recessive trait in the phenotype in the offspring of the first generation if both parents have the Aa genotype?

Both parental individuals with the Aa genotype are capable of producing germ cells of two types – a and A.

When such individuals are crossed among themselves, offspring will be obtained, including the following options:

homozygous individuals showing a recessive trait (aa) – 25%;

homozygous individuals showing a dominant trait (AA) – 25%;

heterozygous individuals showing a dominant trait (2Aa) – 50%.

Thus, in the case of heterozygosity of both parental individuals, the probability of a recessive trait in F1 is 25%.

Answer: 25%.