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11 Cards in this Set
- Front
- Back
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what is it? |
when chance dictates which alleles are passed on |
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how does it work? |
induviduals show variation naturally by chance, the allele for one is passed on more than the other the number with this new allele increases if its passed on and on, it could lead to evolution |
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which type of evolution is more significant? |
depends on the population size |
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what size population does genetic drift have more of an effect on? |
smaller populations chance has a greater effect |
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what is an example of genetic drift? |
evolution of blood groups |
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who show different blood group frequencies? |
native american tribes |
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what blood group do differing tribes have? |
blackfoot indians have mainly group A Navajos have mainly group O |
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how were the tribes found? |
in isolated groups |
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what is the chance regarding the blood groups? |
that group O was passed on more often in the Navajo tribe |
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when does genetic drift have a greater effect? |
if there is a genetic bottleneck |
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what is a genetic bottleneck? |
when a large population suddenly becomes small |
