Migration as a mechanism of evolution: migration is the movement of alleles between populations. Migration means gene flow: ht e transfer of alleles from the gene pool of one population to the gen pool of another. Varies greatly among different species: life cycle with migration. Start with the allele frequency of all a1a1 (one allele is fixed) Migrate a2a2 people so they join the breeding pool of adults. We can now predict the final allele frequencies. Therefore the allele frequencies have change which means evolution happened. Migration violates the hwe, excess in homo and deficit of hetero. Random mating will put this back into hwe: migration in lake erie. Silvereyes: have migrated 5 times in history to different islands. Took blood samples and tested the dna of each sample from the different islands. Graphing showed that there was a decline in allelic diversity in each new population but each is so small it is undetectable.