3.

Non-Mendelian Genetics

Incomplete Dominance. when dominant and recessive traits are combined in the heterozygous state the result in a blending of the traits.

parents have two alleles and often times inheriting those traits may result in a blending of traits.

Codominance. When dominant and recessive traits are combined in the heterozygous state the result is that both both traits are expressed at the same time.

Poly inheritance. When a trait is controlled by more than 1 gene and a variety of phenotypes are seen. 

multiple alleles. when there are more than two alleles for a specific trait. there are 4 phenotypes for human blood: A,B, AB,O there are three alleles that you can possibly inherit from your parent:IA: Type A blood

IB; type B blood

I: type O blood

depending on how the three alleles combine you can have one of four phenotypes of blood. IA and IB are always dominantt over I but are co dominant