Tutsi little relation to the gene pools that had existed a few centuries ago. The social categories are thus real, but there is little if any detectable genetic differentiation between Hutu and Tutsi. Tishkoff et al. (2009) found their mixed Hutu and Tutsi samples from Rwanda to be predominately of Bantu origin, with minor gene flow from Afro-Asiatic communities (17.7% Afro-Asiatic genes found in the mixed Hutu/Tutsi population). Their average height is 5 feet 9 inches, although individuals have been recorded as being taller than 7 feet. Prior to the arrival of colonists, Rwanda had been ruled by a Tutsi-dominated monarchy
Rwandan genocide president, followed by a command to kill Tutsi. The Hutu population, which had been prepared and armed during the preceding months, and maintained the Rwandan tradition of obedience to authority, carried out the orders without question. In Kigali, the genocide was led by the Presidential Guard, the elite unit of the army. They were assisted by the Interahamwe and Impuzamugambi, who set up road blocks throughout the capital; each person passing the road block was required to show the national identity card, which included ethnicity, and any with Tutsi cards were slaughtered immediately. The militias also initiated searches of houses