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Notes: Incomplete/Codominance           (page 12)
Notes: Incomplete/Codominance              (page 12)• So far, we have learned about simple  Mendelian inheritance--traits ...
Notes: Incomplete/Codominance              (page 12)• So far, we have learned about simple  Mendelian inheritance--traits ...
• Incomplete Dominance = The phenotype of  the heterozygote is intermediate between  those of the two homozygotes
Example: Snapdragons• RR = Red
Example: Snapdragons• RR = Red• WW= White
Example: Snapdragons• RR = Red• WW= White• RW = Pink
Example: Hair• CC = Curly    SS = Straight   CS= Wavy
Example: Hair• CC = Curly    SS = Straight CS= Wavy• Punnett square problem: 2 Wavy haired  peoplehave a child       C    ...
Example: Hair• CC = Curly   SS = Straight  CS= Wavy• Punnett square problem: 2 Wavy haired  people marry       C         S...
Practice Problem: Incomplete          Dominance (pg 13)• For each practice problem, draw the Punnett  square and give the ...
(pg 12)• Codominance = the heterozygote produces  the phenotypes of BOTH homozygotes
Example: Chickens• BB = Black• WW = White
Example: Chickens• BB = Black• WW = White• BW = Checkered
Other examplesCows:RR = RedWW= WhiteRW=Roan (red and white spots)Horses:GG = GrayWW = WhiteGW=Apaloosa (white with gray sp...
• Punnett square problem: 2 appaloosa horses  are crossed       G       W   G   W
• Punnett square problem: 2 appaloosa horses  are crossed       G       W   G   GG        GW                            25...
Codominance Practice Problem (pg 13)• For each practice problem, draw the Punnett  square and give the phenotype ratiosA. ...
Output Activity (pg 13)• Make up an incomplete/codominance  problem that requires a Punnett square to  solve. You must mak...
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Notes incomplete codominance

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Transcript of "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.
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