Fixed allele

Hi there kiddo! A fixed allele is like a special kind of button on your shirt. When the button is fixed, it means it's always there and it can't be changed or taken off.

In biology, alleles are different versions of a gene that can determine traits like eye color or height. And when a certain allele becomes fixed in a population, it means that everyone in that population has that same allele - just like everyone in your family might have the same eye color or hair texture.

So, just like a button that's fixed on your shirt, a fixed allele is always there and can't be changed. It's part of what makes each population unique and different from others.