Assuming that the trait represented by the filled symbols below is a rare inherited trait with complete penetrance due to a single gene with alleles A and a, what mode of inheritance does the pedigree suggest?

The correct answer is recessive.

Explanation:

As the rare inherited trait can pass to some of the children and is suppressed in the rest it is most likely to be transferred by recessive alleles of either of the parent.

A recessive trait can be described as a trait that gets masked by a dominant trait. For a person to show a recessive trait in their phenotype, the genotype of the person must contain two recessive alleles for that trait.