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Если учесть, что их религия возникла порядка 1000 лет назад можно предположить что основная доля негроидности пришла к арабам уже в Высокое Средневековье.
Этой точки зрения придерживаются и генетики:
http://www.biomedcen...2148-10-138.pdfThe trans-Saharan slave trade – clues from interpolation analyses and high-resolution
characterization of mitochondrial DNA lineages
Background: A proportion of 1/4 to 1/2 of North African female pool is made of typical sub-Saharan lineages, in
higher frequencies as geographic proximity to sub-Saharan Africa increases. The Sahara was a strong geographical
barrier against gene flow, at least since 5,000 years ago, when desertification affected a larger region, but the Arab
trans-Saharan slave trade could have facilitate enormously this migration of lineages. Till now, the genetic
consequences of these forced trans-Saharan movements of people have not been ascertained.
Results: The distribution of the main L haplogroups in North Africa clearly reflects the known trans-Saharan slave
routes: West is dominated by L1b, L2b, L2c, L2d, L3b and L3d; the Center by L3e and some L3f and L3w; the East
by L0a, L3h, L3i, L3x and, in common with the Center, L3f and L3w; while, L2a is almost everywhere. Ages for the
haplogroups observed in both sides of the Saharan desert testify the recent origin (holocenic) of these
haplogroups in sub-Saharan Africa, claiming a recent introduction in North Africa, further strengthened by the no
detection of local expansions.
Conclusions: The interpolation analyses and complete sequencing of present mtDNA sub-Saharan lineages
observed in North Africa support the genetic impact of recent trans-Saharan migrations, namely the slave trade
initiated by the Arab conquest of North Africa in the seventh century. Sub-Saharan people did not leave traces in
the North African maternal gene pool for the time of its settlement, some 40,000 years ago.
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Он заметен:
https://www.balto-sl...?showtopic=1275