2002f-777 anthropology chromosomepolymorphism dnamutationalanalysis geneticmarkers genetics gn289o52m2002 humanbeings humangenetics humanpopulationgenetics laboratorymanuals methods migrations molecularbiology physical physicalanthropologyandhistory polymorphism population populationdynamics qu25s6172003 singlenucleotide singlenucleotidepolymorphisms variation