Explain how the characteristics of the two types of fish relate to the genetic diversity of the species. (for context they're speaking about the Mexican tetra, the surface one and the blind cave one

So, there are 3 parts that explain the answer to your question.

Explanation:

Part A-

The surface fish live near the surface of the water, and the blind cave fish live in dark subterranean caves. The surface fish have eyes and pigmentation on their bodies. The blind cave fish don’t have eyes, and they’re often albinos.

Part B-

The two fish are of the same species because they can mate with each other. Also, the characteristics of the blind cave fish enable them to live in caves. Eyes need energy. So, developing bodies with no eyes allowed these fish to function more efficiently.

Part C-

The two types of fish developed different traits within their respective habitats. However, as a species, they have some genetic diversity because these populations have different genes between them.