The main advantage of triploids in any form of agriculture is that they are generally sterile. As mentioned above, most plants and animals are diploid, with each cell in their body containing two complete chromosome sets. The normal cell division process associated with growth, termed mitosis, accurately ensures that each new daughter cell receives a complete diploid complement of chromosomes. At sexual maturity, however, an alternate cell division process takes over in the cells that eventually produce the gametes, or eggs and sperm. This process (termed meiosis) involves two distinct steps, referred to as meiosis I and II, respectively. The multiple-step nature assures that each egg or sperm contains only one entire set of chromosomes (a haploid or gametic set, n). The result of this reduction division is that when the sperm and egg reunite at fertilization, the new resulting embryo now has a restored diploid chromosome number.