The SNPs M91, P97, M31, P82, M23, M114, P262, M32, M59, P289, P291, P102, M13, M171, M118 from haplogroup A and SNPs M60, M181, P90 from haplogroup B are missing in people without recent African ancestry. Considering these are the earliest humans in Africa, perhaps someone could explain genetically why they don't exist in non African populations?
Klyosov, A. A. (2011a). The slowest 22 marker haplotype panel (out of the 67 marker panel) and their mutation rate constants employed for calculations timespans to the most ancient common ancestors. Pro- ceedings of the Russian Academy of DNA Genealogy
Cruciani, F., Trombetta, B., Sellitto, D., Massaia, A., Destro-Bisol, G., Watson, E., et al. (2010). Human Y chromosome haplogroup R-V88: A paternal genetic record of early mid Holocene trans-Saharan con- nections and the spread of Chadic languages. European Journal of Human Genetics, 18, 800-807.
Simms, T. M., Martinez, E., Herrera, K. J., Wright, M. R., Perez, O. A., Hernandez, M. et al. (2011). Paternal lineages signal distinct genetic contributions from British Loyalists and continental Africans among different Bahamian islands. American Journal of Physical Anthro- pology, 146, 594-608. doi:10.1002/ajpa.21616