Codomininace: Blood Types
Codominance:

• When an individual, which is heterozygous for a trait, expresses BOTH at the same time.

Example: Blood Types
There are three possible alleles in a population but each individual only carries 2.

IA	IB	i
Dominant	Dominant	Recessive

Possible Outcomes:

IA, IA	Dominant A, Dominant A	A
IA, i	Dominant A, Recessive	A
IA, IB	Dominant A, Dominant B	AB
IB, IB	Dominant B, Dominant B	B
IB, i	Dominant B, Recessive	B
i, i	Recessive, Recessive	0