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Non-Mendelian Genetics

Non-Mendelian Genetics. Incomplete Dominance. Incomplete dominance: occurs in cases in which one allele is not completely dominant over another. Codominance. Codominance: both alleles contribute to the phenotype. Ex: Chickens Either black, white, or speckled black and white.

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Non-Mendelian Genetics

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  1. Non-Mendelian Genetics

  2. Incomplete Dominance • Incomplete dominance: occurs in cases in which one allele is not completely dominant over another.

  3. Codominance • Codominance: both alleles contribute to the phenotype. • Ex: Chickens • Either black, white, or speckled black and white.

  4. Multiple Alleles • Genes that have more than two alleles. • The individual can still only have two alleles. • Ex: coat color in rabbits.

  5. Rabbit Furs cc CC, Ccch,CCh, Cc chc or chch cchch, cchcch, or cchc

  6. Polygenic Traits • Polygenic traits: traits controlled by two or more genes. • Ex. Skin color

  7. Applying Mendel’s Principles • The common fruit fly: Drosophilia melanogaster. • Small, easy to keep in the laboratory, and produce large numbers of offspring in a short amount of time. • Mendel’s principles apply to all organisms.

  8. Genetics and the Environment • Characteristics are determined by interaction between genes and the environment.

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