ANTHR101 Lecture 6: lecture 6
22 Jan 2019
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Gene ow, makes populations more similar to each, and genetic drift is the opposite, more different from each other. Genetic drift: a chance of allele frequencies as a consequence of random changes in population size: the migration of a small sub-population away from the parent population, the founder effect. For ex. a group of 10 people leave a larger population of 1 million. The allele frequency of the large population is a 40%, b 30% o 30%. By chance random picking of those 10 people, the allele frequency will change so for instance by change the group had a 80%, b 10%, o 10%. The new group, founders, will reproduce and the two populations will have different allele frequency for the blood type. This does not affect the large populations genetic diversity, but it affects the small population: the removal of a large portion of the population because of a natural disaster, bottleneck effect.
