Genetics

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Genetics

• Codominance Incomplete Dominance

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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?

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Foldable
Codominance
Incomplete Dominance
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Codominance

• Red x White Red White
• Co together
• coexist (exist together)
• cooperate (work together)
• In codominance, both traits appear (both traits
  are equally dominant)

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Punnett Square Example
CR
CR
C color CRCR red CWCW white CRCW red
white


CW
CRCW
CRCW
CW
CRCW
CRCW

1. Parents with two different phenotypes produce
   offspring with a third phenotype.
2. Both parents traits show up together in the
   offspring.

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Another Example of Codominance
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Other Codominance Examples

• Cattle
• Red x White Roan
• Human Blood Types
• A x B AB

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Incomplete Dominance

• Incomplete dominance produces a mixing or blend
  of the two traits
• Red x White Pink

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Punnett Square Example
R
R


RR red WW white RW pink
W
RW
RW
W
RW
RW

1. Parents with two different phenotypes produce
   offspring with a third phenotype.
2. Both parents traits show up together in the
   offspring.

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Another Example of Incomplete Dominance

• Horses
• Chestnut brown x creamy white
  palomino

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Practice Codominance Incomplete Dominance

• Incomplete and Codominant practice worksheet.doc