Dobzhansky examined the genetic diversity of wild populations and showed that, contrary to the assumptions of the population geneticists, these populations had large amounts of genetic diversity, with marked differences between sub-populations.
Dobzhansky menguji keragaman genetik dari populasi liar dan menunjukkan bahwa, brseberangan dengan asumsi para pakar genetik populasi, populasi tersebut memiliki sejumlah besar keragaman genetik, dengan menandai perbedaan antar sub-populasi.