BIO152H5 Lecture Notes - Lecture 10: Stabilizing Selection, Parasitism, Allele Frequency
Document Summary
Dar(cid:449)i(cid:374)"s 4 steps su(cid:373)(cid:373)arizi(cid:374)g the pro(cid:272)ess of e(cid:448)olutio(cid:374) (cid:271)y natural selection: variation in traits, some of these trait differences are heritable and are passed onto offspring, in each generation, more offspring are produced that can survive. Competition: only some individuals in the population survive long enough to reproduce, and of these, some will produce more offspring than others. (differential reproductive success) Heritable variation leads to different success in survival and reproduction. Change in genetic composition (allele frequencies) of a population over time. Genetic contribution of an individual to subsequent generations relative to the contribution of other individuals. Herita(cid:271)le trait that i(cid:374)(cid:272)reases a(cid:374) i(cid:374)di(cid:448)idual"s fit(cid:374)ess i(cid:374) a parti(cid:272)ular e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t relati(cid:448)e to individuals lacking that trait. Behaviours and physiological processes that help an organism survive in an environment. Diversity of species: some groups of organisms are more successful than others in the numbers of species in that group. Co e(cid:448)olutio(cid:374): 2 i(cid:374)tera(cid:272)ti(cid:374)g spe(cid:272)ies re(cid:272)ipro(cid:272)ally i(cid:374)flue(cid:374)(cid:272)e ea(cid:272)h other"s adaptatio(cid:374)s.
