Final answer:
Fusion of genetic material to form a zygote is an example of sexual reproduction, where a sperm and an egg gamete, created through meiosis, fuse together.
Step-by-step explanation:
When the genetic material in two nuclei fuses together to form a zygote, this is an example of sexual reproduction. During sexual reproduction, specialized haploid cells called gametes fuse together. In most species, these gametes are sperm and eggs, produced via a process called meiosis. Meiosis is responsible for creating haploid cells from a diploid cell, ensuring genetic variety and the continuation of species. A zygote is a diploid cell because it combines the genetic material from two gametes, each from a different parent, leading to a genetically unique organism.