africa anthropology anthropometry blacks chromosomepolymorphism cultural dnafingerprinting dnamutationalanalysis forensicgenetics genetic geneticmarkers genetics genotype humangenetics humanpopulationgenetics huntingandgatheringsocieties khoikhoi(africanpeople) khoisan(africanpeople) laboratorymanuals methods molecularbiology naturalselection physical population populationgenetics qh405c771c1971 qu25s6172003 qz52f7152005 san(africanpeople) selection singlenucleotide singlenucleotidepolymorphisms southern variation