Question

For humans, having freckles is a dominant trait (see image). Not having freckles is recessive.Cross a heterozygous person with freckles with a homozygous recessive person with no freckles.What are the genotypes and phenotypes of the offspring?

Answer 1

Let us represent the heterozygous with freckles by Ff and the homozygous with no freckles by ff. Thus, we construct the following Punnet square:

From this punnet square we see that:

50% of the offspring will be heterozygous with freckles (Ff).

50% of the offspring will be homozygous with no freckles (ff).