Frontmatter -- General Editor's Preface -- Preface -- Introduction -- SECTION ONE Models of Genetic Differentiation -- Adaptation: A Conceptual Framework / MAZESS, RICHARD B. -- Group Selection and Sexual Selection in Human Evolution / HULSE, FREDERICK S. -- Altruism, Group Selection, Human Evolution / ARMSTRONG, RICHARD D. -- Differential Transmission of Genetic and Cultural Information About the Environment: A Cybernetic View of Genetic and Cultural Evolution in Animal Species / BAJEMA, CARL JAY -- Current Directions in Behavior Genetics / VANDENBERG, STEVEN G. -- Effects of Isolation on Genetic Variability: Macaque Populations as Model Systems / MORRIS, LAURA NEWELL / NUTE, PETER E. -- Frequency-Dependent Selection and the ABO Blood Groups / LIVINGSTONE, FRANK B. -- Impact of Neutral Mutations on Evolution / GLUESING, GEORGE R. / ABDEL-HAMEED, FATHI -- Mathematical Aspects of Genetic Equilibrium / CHAKRABORTY, RANAJIT -- SECTION TWO Population Studies -- Multidisciplinary Studies in Tribal Societies and Human Evolution / SALZANO, FRANCISCO M. -- Tapipa: A Negroid Venezuelan Isolate / ARENDS, T. / GALLANGO, M. L. / MULLER, A. / GONZÁLEZ-MARRERO, M. / BANDEZ, O. PÉREZ -- Population Dynamics in Tlaxcala, Mexico: The Effects of Gene Flow, Selection, and Geography on the Distribution of Gene Frequencies / CRAWFORD, Μ. Η. -- Genetic Distances Among Certain Southern African Populations / JENKINS, TREFOR / HARPENDING, HENRY / NURSE, G. T. -- Biology and the History of Southern African Populations / NURSE, G. T. / HARPENDING, HENRY / JENKINS, TREFOR -- Genetic Structure of Ideles / LEFEVRE-WITIER, PHILIPPE / VERGNES, HENRI -- Microevolutionary Dynamics Among the Gavdas of Goa / MALHOTRA, K. C. -- Founder Effect, Gene Drift, and Natural Selection Among Four Nomadic Mendelian Isolates / MALHOTRA, K. C. -- Physical Anthropology of the Angami Nagas (Nagaland, India) / SETH, PRAVEEN KUMAR / SETH, SWADESH -- Blood Protein Polymorphisms and the Problem of Genetic Affinities of the Ainu / OMOTO, KEIICHI -- The Anthropological Usefulness of the IgA Allotypic Markers / SCHANFIELD, M. S. / FUDENBERG, Η. H. -- Biographical Notes -- Index of Names -- Index of Subjects