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outline - Lecture #7- Polygenes and Multifactorial...

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Lecture #7- Polygenes and Multifactorial Inheritance (ch 5, p 94-115; chapter 18, p 427-428) I. Polygenic (quantitative) Inheritance: when more than one gene contributes to a phenotype. A. Mendelian vs Polygenic Traits (figure 5.2) Mendelian traits F1 show one of the parental traits F2 phenotypes are distinct = discontinuous variation Polygenic traits F1 show a phenotype intermediate to that of the parents. F2 show a range of continuously varying phenotypes Characteristics of Polygenic Inheritance B. The Additive Model for Polygenic Inheritance (Handout)
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II. Multifactorial Traits: Interaction between a gene (Multifactorial Mendelian) or genes (Multifactorial Polygenic) with the Environment leads to the phenotype. A. Mendelian and Polygenic Multifactorial traits: B. Multifactorial Threshold Traits (figure 5.7, table 5.1) C. Heritability: the contribution of genetic differences to phenotypic variety in a population (nature vs nurture) genetic variance:
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outline - Lecture #7- Polygenes and Multifactorial...

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