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# Notes incomplete codominance

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### Notes incomplete codominance

1. 1. Notes: Incomplete/Codominance (page 12)
2. 2. Notes: Incomplete/Codominance (page 12)• So far, we have learned about simple Mendelian inheritance--traits controlled by dominant and recessive paired alleles
3. 3. Notes: Incomplete/Codominance (page 12)• So far, we have learned about simple Mendelian inheritance--traits controlled by dominant and recessive paired alleles• However, MOST alleles are not simply dominant or recessive
4. 4. • Incomplete Dominance = The phenotype of the heterozygote is intermediate between those of the two homozygotes
5. 5. Example: Snapdragons• RR = Red
6. 6. Example: Snapdragons• RR = Red• WW= White
7. 7. Example: Snapdragons• RR = Red• WW= White• RW = Pink
8. 8. Example: Hair• CC = Curly SS = Straight CS= Wavy
9. 9. Example: Hair• CC = Curly SS = Straight CS= Wavy• Punnett square problem: 2 Wavy haired peoplehave a child C S C S
10. 10. Example: Hair• CC = Curly SS = Straight CS= Wavy• Punnett square problem: 2 Wavy haired people marry C S C CC CS 25% Curly S CS SS 50% Wavy 25% Straight
11. 11. Practice Problem: Incomplete Dominance (pg 13)• For each practice problem, draw the Punnett square and give the phenotype ratiosA: Cross a pink snapdragon with a white snapdragonB: Cross a red snapdragon with a white snapdragon
12. 12. (pg 12)• Codominance = the heterozygote produces the phenotypes of BOTH homozygotes
13. 13. Example: Chickens• BB = Black• WW = White
14. 14. Example: Chickens• BB = Black• WW = White• BW = Checkered
15. 15. Other examplesCows:RR = RedWW= WhiteRW=Roan (red and white spots)Horses:GG = GrayWW = WhiteGW=Apaloosa (white with gray spots)
16. 16. • Punnett square problem: 2 appaloosa horses are crossed G W G W
17. 17. • Punnett square problem: 2 appaloosa horses are crossed G W G GG GW 25% Gray W GW WW 50% Appaloosa 25% White
18. 18. Codominance Practice Problem (pg 13)• For each practice problem, draw the Punnett square and give the phenotype ratiosA. Cross a checkered chicken with a black chickenB. Cross two checkered chickens together
19. 19. Output Activity (pg 13)• Make up an incomplete/codominance problem that requires a Punnett square to solve. You must make up a NEW trait, and explain the phenotypes of the homozygotes and the heterozygotes in the problem.