Okay, so you know how every living thing is different from each other, right? That's because of their genes - kind of like how you have your mom's eyes or your dad's hair.
Genetic ecology is when we study how those genes affect how living things interact with their environment.
Let's say we have two plants that grow in the same area. One plant has a gene that lets it grow really fast, while the other plant doesn't. That means the first plant might get more sunlight or nutrients before the second plant can grow tall enough to get any. This could mean that the first plant has a better chance of surviving and reproducing.
So basically, genetic ecology is all about understanding how genes influence how living things compete with each other and adapt to their environment.