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| Frage | Antworten |
| genetic drift | a random change in the frequency of alleles within a populations gene pool which can happen very quickly in small populations |
| founder effect | a geographically isolated area has a non-representing sample of alleles from a parent populations |
| bottlenecks | causes by major disaster which kills off most of the population and there is a random chance of which alleles survice so the allele frequency is altered |
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