In humans all reproduction is sexual, it comprises a combination of haploid gamete cells from each parent with half the usual number of chromosomes to produce a novel cell comprising genetic material of both the parents, This is known as a diploid zygote.
When the gametes combine they produce a cell known as a zygote. Human eggs and sperm comprise 23 chromosomes. The human zygotes comprise 46 chromosomes. The kind of cell differentiation, which generates gametes with half the usual number of chromosome is known as meiosis.
