BIOLOGY 1114H Lecture Notes - Lecture 3: Allele, Allele Frequency, Gene Pool
6 Sep 2016
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Document Summary
Evolutionary trees are hypotheses about relationships among different groups. Can be made using anatomical or dna sequence data. Molecular with shared rna, sets of hbox genes, and evo-devo . Results in convergent evolution, analogous features in distantly related groups. Evolution: descent with modification, descent from ancestral forms, natural selection occurs. Artificial selection: when humans select for desired traits and breed those organisms. Natural selection as a mechanism: potential rate of reproduction for most species in very high, most populations are normally stable, resources are limited. Competition for limited resources leads to survival of only portion of offspring. This leads to population wide change with favorable traits accumulating. Fitness: not the strongest or smartest, contribution of individual genes passed on relative to rest of population. Natural selection affects the population, not the individual and is always occurring. Absence of transitional forms and mechanism for inheritance until mendel. Microevolution: change in genotype/allele frequencies in a population over time.
