Lec07.quant.gen - We've seen that there is a complex...

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1 ± We’ve seen that ± there is a complex relationship between phenotype and genotype ± most traits do not have distinct categories and are not produced by one or a very small number of genes ± most traits are continuous (quantitative) and produced by the action of many loci ± Mendelian (discrete, qualitative) genetics is therefore of limited usefulness for many traits and for understanding evolution ± So how might we go about understanding the genetics of quantitative traits and how they evolve? How can discrete genes produce continuously varying traits? Simple case: Two loci, each with two alleles A a and B b (assume p A = p B = q a = q b = 0.5) Let aabb produce the smallest individual (Size = 6 cm) Let A increase size by 2 and B increase size by 1 For example an AAbb individual would be 10 cm (6 + 2 +2) aaBb aaBB AaBb AaBB aB Aabb AaBb AAbb AABb Ab AaBb AaBB AABb AABB AB ab aB Ab AB AaBb aabb aaBb Aabb ab
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2 aaBb (7) aaBB (8) AaBb (9) AaBB (10) aB Aabb (8) AaBb
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Lec07.quant.gen - We've seen that there is a complex...

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