This topic is about biology on the genetic and molecular level. If that sounds scarey, it really isn't. In fact, the topics here are rather interesting.
The biology of making beers and ales (Pick one for a very detailed treatment. This is astandard microbiology topic and the word is not father of the deed!)
The biology of making assorted fermented foods (soy saunce, cheese, yogurt, and/or sour dough bread)
The genetics of feline coat colors (or even a specific color or mutation such as the Rex or hairlesss breeds)?
What is the effect of tetraploidy in plants and why is it desirable?