Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear lobes as opposed to the free ones. The squares represent the male indiones. The squares represent the male individuals and circles the female individuals

Which of one of the following conclusions drawn is correct?

Options

A. The parents are homozygous recessive
B. The trait is Y-linked
C. The parents are homozygous dominant
D. The parents are heterozygous

Answer

D