Question

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 individuals and circles represent the female individuals.
Which one of the following conclusions drawn is correct?

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

Answer 1

The correct option is D The parents are heterozygous

Heterozygous means that a person has two different versions of the gene.

So, the correct answer is 'The parents are heterozygous'.