How many directions do the Allele frequencies shift in?
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The allele frequencies can shift in three directions:
1) Directional selection: This occurs when individuals with a certain allele have a higher fitness advantage over others and thus that particular allele frequency shifts towards the favored allele.
2) Stabilizing selection: This occurs when individuals with an intermediate allele have a higher fitness advantage over others and thus the allele frequency shifts towards the intermediate allele.
3) Disruptive selection: This occurs when individuals with extreme alleles have a higher fitness advantage over those with intermediate alleles and thus the allele frequency shifts towards the extreme alleles.
Overall, allele frequencies can shift in any direction. The direction of the shift depends on the environmental conditions and selection pressures acting on the population.
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