Download - Incomplete and codominance
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Incomplete Dominance and Codominance
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What is codominance?• When two alleles are BOTH expressed togetherExample: blood type– Blood type A = blood cells with A proteins– Blood type B = blood cells with B proteins– Blood type AB = blood cells with A and B proteins
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Processing Piece:• Write “incomplete dominance.” Circle “co” and
write “together.”• Draw a picture to illustrate codominance. Example: Different blood types Example: A flower with red and white spots
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What is incomplete dominance?• Two alleles are blended to produce a “blended
phenotype”Example: color in snapdragon flowers– WW = white– WR = pink– RR = Red
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Processing Piece:
• Draw a picture to illustrate incomplete dominance. Example: White, red, and pink flowers
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Sample Questions 1 and 2:Cow traits:BB = black BW = black and white WW = white1) Is this an example of incomplete dominance or
codominance?2) Two black and white cows are crossed. What are
possible phenotypes, and their %’s, for the offspring? (Draw a Punnet Square.)
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Sample Questions 3 and 4:Cow traits:BB = black BW = grey WW = white3) Is this an example of incomplete dominance or codominance?4) A black cow and a grey cow are crossed. What are possible phenotypes, and their %’s, for the offspring? (Draw a Punnet Square.)
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Sample Questions 5 and 6:Human traits:DD = fatal Dd = dwarfism dd = normal5) Is this an example of incomplete dominance or
codominance?6) A man of normal height marries a woman who is a
dwarf. What are possible phenotypes, and their %’s, for their kids? (Draw a Punnet Square.)
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Exit TicketLabel each of the following as codominance or “incomplete dominance.”1) Blood type A x Blood Type B Blood Type AB2) Red flower x White flower Pink flower3) Red flower x White flower Red & White flower