The crossing of two individuals that have similar characteristics is referred to as inbreeding.

Here's why:

* Inbreeding is the mating of closely related individuals. This close relationship leads to a higher chance of sharing similar genes, resulting in offspring with similar characteristics.

* Outbreeding, on the other hand, is the mating of unrelated individuals, increasing genetic diversity.

Let me know if you'd like to know more about inbreeding or outbreeding!