Origins of Hutu, Tutsi and Twa phenotype, genotype, cultural memory of inhabitants of Rwanda, archeology, and linguistics. Most Tutsis and Hutus carry the E1b1a paternal haplogroup, which is common among Bantu populations. More recent studies have de-emphasized physical appearance, such as height and nose width, in favor of examining blood factors, the presence of the sickle cell trait, lactose intolerance in adults, and other genotype expressions. Excoffier et al. (1987) found that the Tutsi and Hima, despite being surrounded by Bantu populations, are "closer genetically to Cushites and Ethiosemites". Another study concluded that, while the sickle cell trait among the Rwandan Hutu was comparable to that
Hutu Power public life, complete segregation of Hutus from Tutsis, and complete exclusion of Tutsis from public institutions and public life. Hutu Power ideology reviled Tutsis as outsiders bent on restoring a Tutsi-dominated monarchy, and idealized all things Hutu. The Commandments declared that any form of relationship between Hutus and Tutsi women was forbidden; and that any Hutu who "marries a Tutsi woman", "befriends a Tutsi woman", or "employs a Tutsi woman as a secretary or a concubine" was a traitor to the Hutu people. It denounced Tutsis as dishonest in business whose "only aim is the supremacy of his ethnic group";