BIOLOGY 202L Lecture 16: Bio 202 Lectures 16
21 Jan 2016
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Individual born with given phenotype/genotype that does not change to accommodate fitness/other pressures within its lifetime. Multiple individuals must be present in order to have a change in genetic composition. **review most recent lab, do genevol problems (app)** Random genetic variation applied to the organism (mutation) then acted upon by genetic drift and natural selection. Mutation alone is insufficient (very rare and often minor) Migration takes populations that are initially different and homogenizes them. Have identical allele frequencies (same p and q) Depends on viewpoint: more heterozygotes but less differences between individuals . F = 1 [(observed aa frequency) / (expected 2pq hard-weinberg aa frequency)] Only 2 populations: homogenization achieved by either matching source or reaching average. 1-way migration = frequency ultimately matches that of source population over time. 2-way migration = average of the populations: average allele frequencies (p and q) at t=infinity, fst > 0 goes to fst < 0.
