Final answer:
The statement regarding migration causing Hardy-Weinberg disequilibrium by changing allele frequencies between generations is true. Migration or gene flow violates Hardy-Weinberg principles as it alters the genetic makeup of a population and contributes to evolutionary change.
Step-by-step explanation:
Migration can indeed occur at any phase and is one of the factors that causes Hardy-Weinberg disequilibrium and changes allele frequencies between generations, thereby violating Hardy-Weinberg principles. This process, known as gene flow, occurs when individuals move into or out of a population, which can have a significant effect on allele frequencies. Therefore, the statement is True.
Gene flow is one mechanism that introduces new alleles into a population, altering the genetic makeup and potentially contributing to evolutionary change. For the Hardy-Weinberg equilibrium to hold, a population must not experience migration, among other conditions, such as large population size, random mating, no natural selection, and no mutation. When migration occurs, these conditions are not met, leading to disequilibrium.