A couple has two children-a boy and a girl. Both the parents have detached ear lobes while th children have attached ear lobes?
a] How is this possible?
b] Please write the genotypes of the mother, father, te boy and the girl .
(Clue: attached earlobe is represented as e while the detached as E)

Explanation

a) If both the parents were homozygous for detached ear lobe then all their offsprings should have only detached ear lobes. But we find that the children have attached earlobes (ee). This is possible only if both the parents are hybrid (Ee) for the trait.
b] Genotypes of the:
Mother-Ee
Father-Ee
Son-ee
Daughter-ee