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Incomplete Dominance & Codominance

Incomplete Dominance & Codominance. Codominance. red. Defined : when a single gene has more than one dominant allele Ex: Cattle Coat Red cow x White cow = Myth: Colors blend Reality: Both colors are equally seen Ex: Human Blood types Type A x Type B = Type AB. white. roan.

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Incomplete Dominance & Codominance

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  1. Incomplete Dominance & Codominance

  2. Codominance red • Defined: when a single gene has more than one dominant allele • Ex: Cattle Coat Red cow x White cow = • Myth: Colors blend • Reality: Both colors are equally seen • Ex: Human Blood types Type A x Type B = Type AB white roan

  3. Human blood type has 3 alleles Dominant A allele Dominant B allele Recessive O allele Type A & Type B are dominant to type O Type A and Type B are codominant to each other Blood Types Dad will pass 1 of these 3 Mom will pass 1 of these 3 Child genotypes Type A Type A Type AB Type B Type B Type AB Type B Type O Type A

  4. A) Probability of child having type A blood? 25% B) Probability of child having codominant blood? 25% C) Probability of child being Heterozygous? 75% 1 minute: Discuss with your neighbor.Mike is heterozygous for type A blood and Lisa is heterozygous for type B blood. B o A o A B A o B o o o

  5. Draw a pedigree for this family. Complete a Punnett square for Jason and Maria. What were the odds of Rick having codominant blood? 50% 1 minute: Discuss with your neighbor.Jason is homozygous for type A blood and Maria who is heterozygous for type B blood. Their child, Rick, has codominant blood. Type A Type B Jason Maria BB AA Bo Ao Rick Codominant? AB B o A B A A A o A B A o

  6. Defined: Neither allele is completely dominant Heterozygous = blended appearance More than 2 different phenotypes can occur Ex: Many flower colors Incomplete Dominance P P PP P P p p pp p p Red (RR) White (WW) Pink (RW)

  7. What is the probability of obtaining heterozygous fish? Yellow fish? In certain species of fish, blue scales (BB) and yellow (YY) scales are incompletely dominant. Fill in the Punnett square with the genotype of a blue male and a green female. BY B B B Y 50% B B blue green B B B Y 0% blue green

  8. Create a pedigree for these 9 flowers (make the offspring any gender you wish). Create a Punnett square for the parents. Probability of growing pink? Carnations show incomplete dominance where a red allele and white allele blend to make pink. A pink colored male pollinated a pink colored female. 7 seeds were created and later grew into plants with 3 having pink flowers, 2 with white flowers, and 2 with red flowers. RW RW RW RW WW RR RW WW RR R W R R R R R R W W R W W R R W W W 50%

  9. Incomplete vs. Codominance Codominance: Both equally expressed Red flowers + White flowers = Incomplete Dominance: alleles blend Red flowers + White flowers =

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