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Incomplete and Co-Dominance

Incomplete and Co-Dominance. Incomplete Dominance. One allele is not completely dominant over the other. The heterozygous phenotype is in-between the homozygous phenotypes. Incomplete Dominance. If you cross a RED flower with a WHITE flower, you will get a PINK flower. NOTICE :

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Incomplete and Co-Dominance

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  1. Incomplete and Co-Dominance

  2. Incomplete Dominance • One allele is not completely dominant over the other. • The heterozygous phenotype is in-betweenthe homozygous phenotypes.

  3. Incomplete Dominance If you cross a RED flower with a WHITE flower, you will get a PINK flower. NOTICE: the RED genotype is RR the WHITE genotype is WW the PINK genotype is RW

  4. Let’s Practice! Cross a BLACK chicken (BB) with a WHITE chicken (WW). These alleles show INCOMPLETE DOMINANCE. B B What percent is black? White? Gray? BW BW W Black: 0% White: 0% Gray: 100% BW BW W

  5. Let’s Practice! Cross a BLACK chicken (BB) with a WHITE chicken (WW). These alleles show INCOMPLETE DOMINANCE. B B What is the genotype and phenotype of the F1 generation? Genotype: BW Phenotype: Gray BW BW W BW BW W

  6. Let’s Practice! What would the cross look like if you crossed two GREY chickens (BW). These alleles show INCOMPLETE DOMINANCE. B W Genotype: 1 BB 1 WW 2 BW Phenotype: 1 Black 1 White 2 Gray What is the genotype and phenotype of the F2 generation? BB BW B BW WW W

  7. Mrs. Smith and Ms. K’s Memory Trick INcompleteisINbetween

  8. Co-Dominance • Both alleles contribute to the phenotype. • For Example: In chickens, the allele for black feathers is co-dominant with the allele for white feathers. These chickens will have BOTHblack and white feathers.

  9. Let’s Practice! Cross a Black chicken (BB) with a White chicken (WW). These alleles show CO-DOMINANCE. B B How many chickens in the F1 generation are completely black? White? Black and white? BW BW W Black: 0% White: 0% Both: 100% BW BW W

  10. Let’s Practice! Cross a Black chicken (BB) with a White chicken (WW). These alleles show CO-DOMINANCE. B B What is the genotype and phenotype of the F1 generation? Genotype: BW Phenotype: Black and white or checkered. BW BW W BW BW W

  11. Let’s Practice! Cross two Black and White (checkered) chickens (BW). These alleles show CO-DOMINANCE. B W Genotype: 1 BB 1 WW 2 BW Phenotype: 1 Black 1 White 2 Checkered List all possible genotypes and phenotypes of the F2 generation. BW BB B WW BW W

  12. Mrs. Smith and Ms. K’s Memory Trick COdominant alleles COllaborate together

  13. If you need more help… READ PAGE 272

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