1. Codominance & Incomplete Dominance
Genetics
Codominance & Incomplete Dominance

2. Warm up What happens if you mix yellow paint with blue paint?
How could this be used as an analogy to describe the inheritance of certain traits?

3. Foldable
Codominance
Incomplete Dominance

4. Codominance Co = together
Red x White = Red & White
Co = together
coexist (exist together)
cooperate (work together)
In codominance, both traits appear (both traits are equally dominant)

5. Punnett Square ExampleCR CR
C = color
CRCR = red
CWCW = white
CRCW = red & white CW
CRCW
CRCW CW
CRCW
CRCW
Parents with two different phenotypes produce offspring with a third phenotype.
Both parents’ traits show up together in the offspring.

6. Another Example of Codominance

7. Other Codominance Examples
Cattle
Red x White = Roan
Human Blood Types
A x B = AB

8. Incomplete Dominance
Incomplete dominance – produces a mixing or blend of the two traits
Red x White = Pink

9. Punnett Square Example
RR = red
WW = white
RW = pink W RW RW W RW RW
Parents with two different phenotypes produce offspring with a third phenotype.
Both parents’ traits show up together in the offspring.

10. Another Example of Incomplete Dominance
Horses
Chestnut brown x creamy white = palomino

11. Practice: Codominance & Incomplete Dominance
Incomplete and Codominant practice worksheet.doc