So what I‚Äòve heard is that they were nomadic so there were zero women in the group and they intermixed with the women of the place they settled, thus today‚Äôs indians almost look alike. If you pick a person of indigenous tribe and a person of brahman community they‚Äôll look the same their gene pool will be same almost, the r1a haplogroup is present in indigenous people and also in brahmans.