Final answer:
Migration can cause Hardy-Weinberg disequilibrium by introducing genetic drift and altering allele frequencies in a population, and by disrupting gene flow between geographically separated populations.
Step-by-step explanation:
Migration can cause Hardy-Weinberg disequilibrium as it can result in a sudden change in allele frequencies due to the movement of individuals into or out of a population. This can lead to genetic drift, where the frequency of certain alleles changes randomly. For instance, if several white rabbits migrate into a population of predominantly brown rabbits, the allele frequency for white fur will increase in that population. Also, gene flow is disrupted when populations become geographically discontinuous, impeding the movement of alleles between them and potentially leading to divergent evolution in separate populations. In addition, historically significant human migrations, facilitated by global forces such as colonialism and trade, have resulted in the widespread dispersion and mixing of genetic material across the globe.