ANTH 161 Lecture Notes - Lecture 3: Medium Ground Finch, Daphne Major, Allele Frequency
12 Sep 2016
Department
Course
Professor
Document Summary
Population: a group of individuals that can and do interbreed. Evolution: a change in allele frequency from one generation to the next. Mendel"s work suggested two important facts: 1) the units or particles occurred in pairs (laws of segregation and recombination, 2) traits that disappeared were still there (principle of dominant and recessive characteristics) Darwinian natural selection + mendelian genetics = the modern synthesis (mechanism for change, and a mechanism for expression of characteristics) This variation affected fitness: birds with deep beaks ate more, so, were better able to survive, so, were more likely to reproduce, so, were more likely to pass their alleles to the next generation. So during selection (drought) what happened: there were fewer birds in total, but the average beak depth had increased. Important: remember that the individual birds did not evolve or change (no lamarck), but the. Population evolved to have more deep beak alleles than before (change in alleles)
