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Types of Inheritances III

Types of Inheritances III. Pp 237, 242-245. Multigene Traits. More than one gene is responsible for a trait (phenotype). Epistasis. Epistasis. One gene affects the outcome of the other gene Ex: Labrador Retriever's coats are controlled by two genes: E and B.

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Types of Inheritances III

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  1. Types of Inheritances III Pp 237, 242-245

  2. Multigene Traits • More than one gene is responsible for a trait (phenotype)

  3. Epistasis

  4. Epistasis • One gene affects the outcome of the other gene Ex: Labrador Retriever's coats are controlled by two genes: E and B. - E gene: if pigment is present or absent - B gene: how much pigment is present

  5. Polygenic traits

  6. Polygenic traits • These traits are continuous and many genes are responsible for producing one trait • Actual number is unknown but it is hypothesized that up to 16 genes are responsible for eye color

  7. Environmental

  8. Environmental • Environment such as soil pH can influence the expression of a gene

  9. Sex-influenced trait • Similar to environmental influenced trait but think of the human body as an internal environment • Controlled by autosomes, but influenced by sex hormones • Specific hormones influence trait/genotype Ex: More testosterone = more baldness

  10. Scientists Have Observed Epigenetic Memories Being Passed Down For 14 Generations

  11. Epigenetics • The study of changes in an organism’s phenotype without a change in genotype • Environmental exposures can change the way your DNA works (without changing the DNA itself) and passed on to your offspring. • Changes have to occur in the gametes (not body cells)

  12. What type of inheritance determines skin color?

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