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Chapter 9

NATS 1840 Chapter 9: 9.3-Effects of Genetic Variations on Population Size

Natural Science
Course Code
NATS 1840
Carl Wolfe

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Genetics vs Population Size
-Founder effect: occurs when few individuals in a population colonize a new habitat that
is geographically isolated from other members. Limited genetic diversity threaten
-Demographic Bottleneck: when only few individuals in a population survive a
catastrophe, lack of genetic diversity make it hard to rebuild population.
-Genetic Drift: random changes in population gene frequencies, leads to unequal
reproductive success.
-Inbreeding: individuals of a small population mate with each other, defective genes.
- When individuals of a small population disperse and exchange genes with other
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