Final answer:
Fertilization is the process in which gametes (an egg and a sperm) fuse to form a zygote. It typically occurs through sexual intercourse.
Step-by-step explanation:
Fertilization is the process in which gametes (an egg and a sperm) fuse to form a zygote. The egg and sperm each contain one set of chromosomes. The meeting of the sperm and egg is called fertilization, and it typically occurs through sexual intercourse. The successful fertilization leads to the development of a diploid cell called a zygote.