BIO 465 Lecture Notes - Lecture 7: Genetic Drift, Frequentist Probability, Sampling Error
Document Summary
Thursday, february (cid:400)(cid:404), (cid:401)(cid:399)(cid:400)8 (cid:400)(cid:399):(cid:403)(cid:403) am: genetic drift = changes in allele frequency due to random chance, example: flood happens to red-headed family having picnic by river, they all die so no more red- heads in the town. Evolution occurred, not natural selection = drift: deaths unrelated to the phenotypes of alleles eliminated. Flip a coin (cid:401)(cid:399) times = (cid:400)(cid:401) head & 8 tails, even though (cid:404)(cid:399)/(cid:404)(cid:399)% chance so smapling error occurred. X-axis = score / allele freq in new gen. Mean = (cid:404)(cid:399)% or diff #, # of allele freq in prev gen. Insulators - materials in which charges are hard to mov; ex: plastice. Allele frequency the same if pulled infinity out of infinity. Fast flood and individuals who can swim survive = even though fats timeframe = selection.
