Question

Two parents are both heterozygous for attached earlobes,a simple recessive trait. what percentage of their children can be expected to have attached earlobes

Answer 1

Genotypes of parents are both Hh as they are heterozygous, so two heterozygous parents will produce only one homozygous recessive child (hh genotype), which will cause the child to have attached earlobes since it is the simple recessive trait so it is a 25% chance

Answer 2

100% because both parents have the genes