BRAINCAKEIsolation
The Hardy-Weinberg principle assumes that there is no migration: no individuals, and so no alleles, move into or out of the population. The movement of alleles between populations is called gene flow. Immigration brings in new alleles and emigration removes alleles, and both change allele frequencies.
Isolation is the separation of populations so that gene flow between them stops. Once two populations are isolated, their gene pools change independently. Different mutations arise in each, different selection pressures act, and genetic drift works differently, so their allele frequencies diverge.
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Key terms in this lesson
- speciation
- The formation of new species when populations become unable to interbreed to produce fertile offspring.
More in Gene Pools
- Conditions of the Hardy Weinberg Equilibrium
- Mutations
- Non-Random Mating
- Different Sized Populations
- Selection Pressure
- Population Bottlenecks
- The Founder Effect
- Stabilising Selection
All 16 lessons in Gene Pools · All Edexcel A-level Biology topics