The type of reproduction that involves the fusion of male and female gametes is called sexual reproduction.

Here's why:

* Gametes: These are specialized reproductive cells (sperm in males and eggs in females) that carry half the genetic material of the parent organism.

* Fusion: When a sperm cell and an egg cell fuse, it's called fertilization. This creates a zygote, which has a full set of genetic material (half from each parent).

* Genetic Diversity: Sexual reproduction leads to offspring with a unique combination of genes from both parents, contributing to genetic diversity within a species.

Let me know if you'd like to learn more about the different stages of sexual reproduction!