You are presented with the question "What occurs when individuals move into a population?" and the following answer choices: 
- resistance
 - spread flower seeds
 - rapid expansion
 - alleles move in
 - Leptospirosis
 - survival
 - competition
 - permineralization

Now knowing that gene flow occurs when individuals move into or out of a population and gene flow is the movement of alleles in or out of a population, choose the best answer.


 

    alleles move in     