How does natural selection change a population at the level of genes? It changes the frequencies of alleles that encode traits. This process is called microevolution.

Studying natural selection is often complex because organisms have many traits that interact with the environment and generation times can be long. But, what if we could speed up time and make selection act on a single trait? In this topic you'll do just that.

What you'll learn in this topic

How natural selection...

• Can lead microevolution.
• Results in populations that are better adapted to their environment.

Your task is to is to act as an agent of natural selection on a population of moths and determine whether your actions have resulted in microevolution.