Tuesday November 28

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Tuesday November 28

• Turn in 1) Your monohybrid problem with answer
• On DesK Packet open to page 15
• To do
• Incomplete dominance and codominance
• Quiz
• Get print out of grades and work returned

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Homework

• Packet page 20-21 17-20
• Read sperm quality article
• Extra credit due by this FRIDAY

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Mendel Law of Dominance. Distinct
(contrasting) traits

• One or the other
• A. seed color- yellow OR green
• B. Seed shape - Round OR wrinkled
• C. Pod color- yellow OR green
• D. Pod shape - inflated OR constricted
• E. Flower color- Red OR white
• F. Flower position- axial OR terminal
• G. Stem length - long OR short

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Another type of genetics problem Incomplete
Dominance

• Heterozygous- blended
• This happens in 4 oclock flowers.
• RR - Red Rr - Pink rr- white

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How know it is an incomplete dominance problem?

• Problem will say. Red flowers are incompletely
  dominant to white flowers.
• If the heterozygous gives you a blend (or
  mixture) of the dominant and recessive
• Example Black feathers is incompletely dominant
  to white feathers. How would you make a key?
• How many phenotypes are possible for incomplete
  dominance genetics problems

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rr
RR
Rr
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Another type of genetics problem Codominance

• CO means both
• So the two versions of the trait are equally
  strong. So in the heterozygous they both will
  show.
• Cows- coat color of Roan. Red coat is codominant
  with white coat.
• R- Red r - white
• RR- red Rr- red white rr- white

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