a Caucasoid-Mongoloid gradient. [ 21 ] More specifically, the ethnic groups Cavalli-Sforza said were in the Northeast and East Asian cluster were the Koryak , Chukchi , Reindeer Chukchi , Nganasan Samoyed , N. Tungus , Nentsy , N. Chinese, Tibetan , Bhutanese , Ainu , Mongol , Japanese and Korean