Question

Polydactyly is a dominant trait. what symbol on a pedigree chart would represent a male who has polydactyly

Answer 1

The right answer is a colored square (or shaded).

Polydactyly is defined as the presence of one or more extra fingers in the hand or one or more toes in the foot.

It is a dominant trait, it means that the heterozygotes will express the trait.

In general, healthy men are represented by white squares, while sick men are represented by colored squares (most often in black).