When we look at a species, oftentimes we notice that they do not all look exactly the same. Perhaps the color of their fur differs or the length of their legs varies. This variation is natural and is essential for survival. In this episode, we explore how this variation can be preserved in order to maintain a healthy population. The six mechanisms we discuss are balanced polymorphism, sexual reproduction, outbreeding, diploidy, heterozygote advantage, and frequency dependant selection.