Lecture 10 (deleted 4f50fba2-1dcdc3-ad76d0c5)

31 dierent types of quan7ta7ve traits con7nuous traits

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Unformatted text preview: ssign genotype based on phenotype alone. 26 13 2/23/12 The rela7onship between genotype and phenotype The rela7onship between con7nuous traits and genotype is oten complex. Rela7ve number of progeny Reason 1: Polygenic basis Phenotype classes For a quan7ta7ve trait, many genes may contribute to a single phenotype. 27 The rela7onship between genotype and phenotype The rela7onship between con7nuous traits and genotype is oten complex. Reason 2: Environmental effects For a quan7ta7ve trait, each genotype may produce a range of possible phenotypes. 28 14 2/23/12 The rela7onship between genotype and phenotype The rela7onship between con7nuous traits and genotype is oten complex. Polygenic basis and environmental effects: One gene Two genes Three genes Many genes Aa aa AaBb Aabb AA aabb AABb AABB Varia7on in phenotype Most complex traits are influenced by both genes and the environment; only a few genes and a liule environmental noise produces a “con7nuous” distribu7on of phenotypes. 29 Diffe...
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This note was uploaded on 01/30/2013 for the course BIO LS1B taught by Professor Andrewberry,hopihoekstra,maryellenruvolo during the Spring '12 term at Harvard.

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