Migration has a big effect on how genes mix and how populations change over time. Here’s how it works:

1. Gene Flow:

   • When animals or plants migrate, they bring new genes into their new homes. This adds more variety to the gene pool, making the population more diverse.
   • However, too much mixing can make it harder for local species to adapt to their specific environment.

2. Population Evolution:

   • When animals or plants move to new places, they can face new challenges from the environment. This can lead to natural selection, where the best-suited individuals survive and reproduce.
   • It is believed that about 10% of the differences in genes within a population can come from migration.

3. Statistics:

   • Research shows that populations with a lot of migration (like those with more than 50 individuals moving each year) have 20-30% more genetic diversity than those that are cut off from others.

In simple terms, migration helps mix genes and can change how populations grow and adapt over time.