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genetic diversity and natural selection
genetic diversity
genetic bottlenecks
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the founder effect
biology > paper 1 > genetics, variation, and relationships between organisms > genetic diversity and natural selection > genetic diversity > genetic bottlenecks
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a
genetic bottleneck
is an event which causes a big
reduction
in a
population
, eg. a
large number
of the
population dying
2. this
reduces
the number of
different
alleles
in the gene pool so
reduces
genetic
diversity
3. the
survivors reproduce
and a
larger population
is created but with
reduced genetic diversity
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