Disruptive selection, also known as diversifying selection, describes population genetic changes that favor extreme values of a trait over intermediate values.
In this instance, the trait's variation increases, and the population is split into two groups.
Examples of Disruptive selection
The size of the beaks of Galapagos finches is a typical example of disruptive selection.
Peppered moths are also one of the most well-studied disruptive selection instances.