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AnthWeek 6

by: Victoria Jackson

AnthWeek 6 ANTH 2414

Victoria Jackson
Texas State
GPA 3.2

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Genetic drift & gene flow
Biological Anthropology
Nicholas Herrmann
Class Notes
25 ?




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This 2 page Class Notes was uploaded by Victoria Jackson on Friday October 7, 2016. The Class Notes belongs to ANTH 2414 at Texas State University taught by Nicholas Herrmann in Fall 2016. Since its upload, it has received 3 views. For similar materials see Biological Anthropology in ANTH at Texas State University.

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Date Created: 10/07/16
Biological Anthropology Week 6 Mechanisms of Evolution & Population Genetics Review Factors that change allele frequencies (evolution):: 1. New variation introduced to population (Mutation) 2. Redistribution of alleles (Gene Flow, Genetic Drift) 3. Selection of advantageous allele combinations (Natural Selection) Gene Flow ● A one way or reciprocal movement into different groups ○ Individuals of a population may move into another population, causing allele frequencies to change as those alleles are passed down more (or less) in future generations. ● This DECREASES variation between the groups and INCREASES the variation within the group. Genetic Drift ● When a populations allele frequencies even out to an equilibrium over time. Everyone has the same alleles. ● OPPOSITE of gene flow! ○ This INCREASES variation between the groups and DECREASES the variation within the group. ● Directly related to population size ● Causes of Genetic Drift: ○ Small population size ○ Disproportionate contributions of genes to succeeding generations ● Bottleneck effect: ● The bottleneck effect is when a LARGE population is suddenly reduced to a small population (catastrophic event, migration, colonization) and the small populations alleles were the only ones passed, causing less variation and more similar genetic makeups. ● Founder Effect- ○ Similar to bottleneck, differentiated in two ways: i. Population size is much SMALLER ii. Is primarily resulted from colonization- small populations leaving and becoming isolated.


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