So in some individuals, within the somatic cells of some individuals, we can either have an extra copy of a chromosome or we can have one less chromosome than we normally have. So we can either have 47 chromosomes or 45 chromosomes. And in either case, these conditions are known as annuploid. So, once again, as we saw just a moment ago when we discussed the human cargotype, we saw that every single one of these chromosomes came with a pair. And this is known as dimic conditions. And so each one of these pairs describes a dilmic condition, because we have only two per pair.