ANTHR101 Lecture Notes - Population Genetics, Genetic Drift, Allele Frequency
4 Dec 2012
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Document Summary
Adaptation: organisms respond to selective pressures ie, wearing a coat in cold weather. Genetic adaptation: over several generations, applies only to populations, genes can not change over time instinct: wired within a species. Acclimatization: physiological change within individuals to environmental pressure. Migration (gene flow): movement of alleles from one population to another as a result of. Different populations become more similar, individuals within the population become less similar. Genetic drift: change of allele frequencies as a consequence of random changes in population size. Migration of a small sub-population away from the parent group - obliteration of a large portion of the population because of a natural effect (bottleneck effect) Different populations become less similar, individuals within the group are more similar. Populations differ in allele frequencies, but not in their presence. Mapping allele distribution generally results in a cline effect. How to define units of classification - geography, ethnicity, etc. More genetic variation within races than between them.
