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Published byIrwan Irawan Modified over 5 years ago
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Pick up your plickers card and worksheet BEFORE the bell rings
Bell Work Pick up your plickers card and worksheet BEFORE the bell rings
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Incomplete Dominance vs. Codominance
Mrs. Stewart Biology
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Standards CLE Compare different modes of inheritance.
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Lesson Objectives Correctly create and analyze the punnett square results from incomplete and codominant crosses Can identify scenarios of incomplete dominance and codominance successfully
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Three types of dominant relationships for alleles
Complete dominance Monohybrid crosses Dihybrid crosses Incomplete dominance Codominance
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Complete Dominance Standard dominant vs recessive relationship
If dominant allele is present – you get dominant phenotype If dominant allele is not present – you get recessive phenotype Ex: Tongue Rolling (RR or Rr = can roll tongue, rr = can’t)
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Incomplete dominance One is not completely dominant over the other
Instead, heterozygotes will have a blending of the dominant and recessive traits
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Incomplete Dominance Heterozygous = Blend/combo of the parent phenotypes Phenotype = number of horns 3 possible phenotypes = incomplete dominance
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Incomplete Dominance - Alleles
RR = red Rr = pink rr = white If you cross a red flower with a pink flower, what percentage of the offspring will be white? Red?
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Codominance Both alleles for a gene are expressed in the heterozygotes – simultaneously (at same time) Neither allele is dominant and they do NOT blend together
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Codominant Alleles Since both are dominant and both are seen, we typically write them as different capital letters. WW = white horse GG = gray horse WG = Apaloosa horse (white horse with gray spots)
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Plickers Practice Snapdragons are flowers that can be either white, red or pink. How is color inherited? A = complete dominance B = incomplete dominance C = codominance D = none of the above
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Plickers Practice Cross a pink snapdragon (Rr) with a pink snapdragon (Rr). What is the probability that the offspring will be white? A = 100% B = 75% C = 25% D = 0%
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