C. Beyond Dominant and Recessive Alleles 1. Incomplete Dominance a. One allele is not completely dominant over another b. The heterozygous phenotype is.

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Presentation transcript:

C. Beyond Dominant and Recessive Alleles 1. Incomplete Dominance a. One allele is not completely dominant over another b. The heterozygous phenotype is somewhere between the two homozygous phenotypes. c. Example: snapdragons

2. Codominance a. Both alleles contribute to the phenotype b. Example: human bloodtype

3. Multiple Alleles a. Many genes have more than two alleles b. Example: Rabbit coat color (4 alleles)

4. Polygenic traits a. Traits that are controlled by two or more genes b. Example: Human skin color is probably controlled by more than 4 different genes

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