LIFESCI 2D03 Lecture Notes - Lecture 6: Allele Frequency, Regression Analysis, Heritability
24 Sep 2017
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Natural selection differential reproduction & survivorship among individuals within a population. Heritable genetically-based trait that can be passed from parents to their offspring. Evolution changes in allele frequency (dna sequence) in a population over time. Da(cid:396)(cid:449)in"s conditions re(cid:395)ui(cid:396)ed fo(cid:396) e(cid:448)olution (cid:271)y natu(cid:396)al sele(cid:272)tion (origin of species 1850s: variation exists among individuals in a population in the traits they possess, traits confer differences in survivorship and reproduction, a measure we call fitness. Individuals different traits are, at least in part, heritable. Evolution by natural selection favours behavioural adaptations that enhance fitness. Gene alleles are the basis of phenotypic traits: phenotype not always something you can see with the naked eye (ex. Natural selection acts on heritable variation among individuals and can result in changes in allele frequencies and associated trait values in a population. Traits that confer (allows for) high fitness increase over time, while those that confer low fitness decline.
