LIFESCI 2D03 Chapter Notes - Chapter 4: Phenotypic Trait, Genetic Predisposition, Epistasis
6 Sep 2018
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Chapter 4 behavioral genetics: genetic predisposition to exhibit different behaviors: genes influencing behaviors, ge(cid:374)es do(cid:374)"t tell the (cid:449)hole sto(cid:396)(cid:455); the e(cid:374)(cid:448)i(cid:396)o(cid:374)(cid:373)e(cid:374)t, too, (cid:272)a(cid:374) st(cid:396)o(cid:374)gl(cid:455) affe(cid:272)t the (cid:271)eha(cid:448)io(cid:396) of animals. Its behavioral phenotype value (p) is the result of three factors: its genotype (g) at all loci (locations) that affect the behavior, the environment (e) it has experienced, any interaction between them more formally, gene-environment interactions (g e) Ve=variation due to environmental effects (includes all the environmental conditions that individuals experience as well as their responses to those conditions: heritability: the proportion of phenotypic variation in a population that is due to genetic variation. In chapter 3: heritability is commonly determined using parent-offspring regression. Mean trait values of parents are regressed against the mean trait values of their offspring. The slope of the regression (range from zero to one): the higher the slope value=the more offspring resemble their parents.
