BIOL 102 Lecture Notes - Lecture 8: Gene Flow, Genetic Drift, Quantitative Trait Locus

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Hardy weinberg: predict how much a population has evolved, relative to phenotype and genotype, between generations. Selection equation: amount of change in the phenotype if we know heritability and the strength of selection. E(cid:454)a(cid:373)ple questio(cid:374): (cid:862)(cid:271)iologist is tracking a gene and it has 3 alleles in the entire population, how (cid:373)a(cid:374)(cid:455) possi(cid:271)le ge(cid:374)ot(cid:455)pes are there(cid:863: p2 + 2pq + q2 = 1. Polygenic inheritance often creates quantitative variation; occasional discrete. Depends on whether or not phe0notype or genotypes are being observed. First animal with limbs evolved set the body plan for the future started with four li(cid:373)(cid:271) (cid:862)pla(cid:374)(cid:863) (cid:862)ge(cid:374)eti(cid:272) tool kit(cid:863) finely orchestrated, cannot work; developmental process would break down. Details can be tweaked but the original blueprint is stuck; will only have the four limbed body plan cannot magically change to a 6 limb body plan. Know what the variables in the equations are. Most important thing controlling genetic drift: ne this is what the environment acts on.

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