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Day 10
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Lecture 10:Chapter 5:
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Genetic drift:
Experimental demonstration of genetic drift in drosophila:
- Peter Buri (1956) established 107 population each with 16 flies
- All starting individuals bw75/bw
- Kept for 19 generations at a constant size of 16
- During the experiment he recorded the allele and genotype frequencies.
, -
Due to genetic drift:
-
, Extreme cases of genetic drift:
- Founder effect
o Small group splits off and starts a new colony
- Bottleneck
o Some factor (disaster) reduces population to small number and then population
recovers and expands.
Distribution of blood types:
- Distribution of the O type blood allele in native populations of the world reflects original
settlement
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