http://en.wikipedia.org/wiki/Moors#Huma ... n_genetics
 Human population genetics
Dr. Shomarka Keita, a biological anthropologist from Howard University, has suggested that populations in Carthage circa 200 BC and northern Algeria 1500 BCE were very diverse. As a group, they plotted closest to the populations of Northern Egypt and intermediate to Northern Europeans and tropical Africans. Keita stated “ The data supported the comments from ancient authors observed by classicists: everything from “fair-skinned blonds to peoples who were dark skinned ‘Ethiopian’ or part Ethiopian in appearance.” Modern evidence showed a similar diversity among present North Africans, suggesting that migrations did not affect this area. Moreover, this “diversity” of phenotypes and peoples was probably due to “in situ” differentiation, not foreign influxes.
Since Homo Sapiens have lived in Africa longer than elsewhere, and given the size and different environments of the continent, it is easy to conclude that phenotype diversity there would be greater than elsewhere. Everyone from fair skinned, blue-eyed Berbers to West Africans with the stereotypical “negroid” features to East Africans of Ethiopia with “Near Eastern” features” can all be rooted to the continent itself and not to invasion. The modern differences between Egyptians, Algerians, Ethiopians, Nigerians and Sudanese exist for the same reasons it does between Chinese, Indians and Arabs: intercontinental diversification over tens of thousands of years. Albert Hourani, author of “History of the Arab Peoples” sums up the state of current knowledge: “ The expansion of the Banu Hilal and other Arab tribes (13th century), like the initial Arab conquests, does not seem to have involved sufficiently large numbers to transform the make-up of the Maghrebs population”.
The moors dont seem to be a strictly black group