BS110

When multiple genes affect 1 trait.

Continous variation is a characteristic of polygenic inheritance. (e.g. height of humans)

• When a single gene affects multiple different traits.
• Exam a defect in gene which codes for a protein for oxygen transport leads to disfunctions throughout the body (kidney, heart, etc)

Gene-> protein -> trait 1, 2, 3

One gene affects the action of another gene (e.g. pigmentation)

When multiple alleles produce more than two distinct phenotypes (e.g. blood group in humans)

2

3