General Editor's Preface -- Preface -- Introduction -- SECTION ONE: MODELS OF GENETIC DIFFERENTIATION -- Adaptation: A Conceptual Framework -- Group Selection and Sexual Selection in Human Evolution -- Altruism, Group Selection, and Human Evolution -- Differential Transmission of Genetic and Cultural Information About the Environment: A Cybernetic View of Genetic and Cultural Evolution in Animal Species -- Current Directions in Behavior Genetics -- Effects of Isolation on Genetic Variability: Macaque Populations as Model Systems -- Frequency-Dependent Selection and the ABO Blood Groups -- Impact of Neutral Mutations on Evolution -- Mathematical Aspects of Genetic Equilibrium -- SECTION TWO: POPULATION STUDIES -- Multidisciplinary Studies in Tribal Societies and Human Evolution -- Tapipa: A Negroid Venezuelan Isolate -- Population Dynamics in Tlaxcala, Mexico: The Effects of Gene Flow, Selection, and Geography on the Distribution of Gene Frequencies -- Genetic Distances Among Certain Southern African Populations -- Biology and the History of Southern African Populations -- Genetic Structure in Ideles -- Microevolutionary Dynamics Among the Gavdas of Goa -- Founder Effect, Gene Drift, and Natural Selection Among Four Nomadic Mendelian Isolates -- Physical Anthropology of the Angami Nagas (Nagaland, India) -- Blood Protein Polymorphisms and the Problem of Genetic Affinities of the Ainu -- The Anthropological Usefulness of the IgA Allotypic Markers -- Biographical Notes -- Index of Names -- Index of Subjects.