When more than one gene pair affects a particular trait expression, this is called ________.

A) diploidy
B) autosomal
C) genotypic
D) polygenic
E) y-linked

Polygenic

Relating to a hereditary disease or normal characteristic controlled by the interaction of genes at more than one locus.

Trait Expression

The process by which an organism's genetic code influences its phenotypic traits, resulting in visible or measurable characteristics.