Final answer:
A zygote is a diploid cell of mixed parentage. It is formed when a sperm and egg combine during fertilization and contains all the genetic material needed to form a new individual.
Step-by-step explanation:
A zygote is a diploid cell of mixed parentage. When a sperm and egg combine during fertilization, they form a zygote that contains two sets of chromosomes, one from each parent. The zygote is the first cell of a developing human and contains all the genetic material needed to form a new individual.