Codominance & Incomplete Dominance Genetics Codominance & Incomplete Dominance

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?

Foldable Codominance Incomplete Dominance

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)

Punnett Square Example CR 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.

Another Example of Codominance

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

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

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.

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

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