 Both diploid ancestors had two sets of 7 chromosomes, which were similar in terms of size and genes contained on them.Durum wheat contains a hybrid genome with two sets of chromosomes derived from "Triticum urartu" and two sets of chromosomes derived from "Aegilops speltoides".Each chromosome pair derived from the "Triticum urartu" parent is homoeologous to the opposite chromosome pair derived from the "Aegilops speltoides" parent, though each chromosome pair unto itself is homologous.