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Incomplete and Co-Dominance. Incomplete Dominance One allele is not completely dominant over the other. The heterozygous phenotype is in- between the.

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Presentation on theme: "Incomplete and Co-Dominance. Incomplete Dominance One allele is not completely dominant over the other. The heterozygous phenotype is in- between the."— Presentation transcript:

1 Incomplete and Co-Dominance

2 Incomplete Dominance One allele is not completely dominant over the other. The heterozygous phenotype is in- between the 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. BB W W BW What percent is black? White? Gray? Black: 0% White: 0% Gray: 100%

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

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

7 Mrs. Smith and Ms. K’s Memory Trick INcomplete is INbetween

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 BOTH black and white feathers.

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

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

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

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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