variation and selection
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4 Terms
1
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what are the 4 causes of variation
mutation
crossing over of chromatids
independent segregation of chromosomes
random fertilisation
2
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what happens in disruptive selection
individuals with extreme phenotypes at either end of the range are more likely to survive and reproduce
3
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what happens in stabilising selection
the individuals with the alleles closer to the middle of the range survive and reproduce
the extreme phenotypes are eliminated
4
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what happens in directional selection
the individuals with one extreme advantageous alleles survive and reproduce
Note 
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