I have already argued that major Y-Haplogroup of North Africans is close to their dark skinned southern Africans. However, their skin colour and looks differ. I have argued it is probably because of matrilineages that are close to European matrilineages. Hebrew Bible gives some clues for this.
# And there was a famine in the land: and Abram went down into Egypt to sojourn there; for the famine was grievous in the land.
# And it came to pass, when he was come near to enter into Egypt, that he said unto Sarai his wife, Behold now, I know that thou art a fair woman to look upon:
# Therefore it shall come to pass, when the Egyptians shall see thee, that they shall say, This is his wife: and they will kill me, but they will save thee alive.
# Say, I pray thee, thou art my sister: that it may be well with me for thy sake; and my soul shall live because of thee.
# And it came to pass, that, when Abram was come into Egypt, the Egyptians beheld the woman that she was very fair.
# The princes also of Pharaoh saw her, and commended her before Pharaoh: and the woman was taken into Pharaoh's house.
As the characters of the Hebrew Bible are traced to present day Iraq/Iran regions, the chances are high that they were originally Y-Haplogroup J2a and mtDNA H or U people. It is likely at least one of the mutations responsible for light skin (on SLC24A5) arose in North-West of India. We have to observe West Asia aboriginal male J, European aboriginal male I are closely related to Indian aboriginal male H.
I have blogged about a recent study that discusses how West Asia and Europe is colonized by Proto-Indians. I feel we need to study some of our lighter skinned tribes like Halakki-s in Karnataka. Though their Y-Haplogroup is predominantly H, their mtDNA is majorly U something that is predominant in West Asia, North Africa and Europe.