progenitor [progenitors](someone who originates something) noun [UK: prəʊ.ˈdʒe.nɪ.tə(r)] [US: proʊ.ˈdʒe.nɪ.tə(r)]
ефекат оснивача noun {m}
founder effect(lessening of genetic variation when the entire population descends from a small number of founders) noun [UK: ˈfaʊn.də(r) ɪ.ˈfekt] [US: ˈfaʊn.dər ɪ.ˈfekt]