VUBio110B-Sp'08-Mendelian Genetics 4 - thru polygenic- env't - Pedigree intro - POST

VUBio110B-Sp'08-Mendelian Genetics 4 - thru polygenic- env't - Pedigree intro - POST

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SO FAR— Single gene – 2 or more alleles complete dominance incomplete dominance codominance multiple alleles pleiotropy What about traits controlled by more than one gene (polygenic) and environmental influence? epistasis (modified 9:3:3:1 ratios) quantitative traits environment
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Epistasis • B_ = black • bb = brown • C_ = pigment deposited • cc = no pigment deposited Modified 9:3:3:1 = 9:3:4
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Other modified 9:3:3:1 ratios = gene interaction e.g., anthocyanin in flowers (purple pigment) 9 C_P_ = Flowers colored 3 C_pp = Flowers white 3 ccP_ = Flowers white 1 ccpp = Flowers white = complementation Modified 9:3:3:1 = 9:7 http://www.ndsu.nodak.edu/instruct/mcclean/plsc431/mendel/mendel6.htm
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Other modified 9:3:3:1 ratios = gene interaction e.g., kernel color in wheat 9 A_B_ = colored kernels 3 A_bb = colored kernels 3 aaB_ = colored kernels 1 aabb = colorless kernels = duplicate gene action Modified 9:3:3:1 = 15:1 http://www.ndsu.nodak.edu/instruct/mcclean/plsc431/mendel/mendel6.htm
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Quantitative Traits (continuous vs. discrete)
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Genotype + Environment produces a range of phenotypes
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Results of polygenic inheritance (and environment!)
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This note was uploaded on 04/07/2008 for the course BSCI 110B taught by Professor Due during the Spring '08 term at Vanderbilt.

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VUBio110B-Sp'08-Mendelian Genetics 4 - thru polygenic- env't - Pedigree intro - POST

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