Discusses how genetic data on present human population relationships and data from the Pleistocene fossil hominid record are being used to compare two contrasting models for the origin of modern humans. (TW)

This study discusses the behavior of the females of the parasitic wasp Nasonia vitripennis, which adjust the sex ratio of their broods according to whether or not they are the first or second wasp to parasitize a host. The results provide a quantitative test of sex ratio theory. (Author/SA)

Discusses a publication entitled "Sociobiology" which contends that man's behavior is genetically determined, and the controversy surrounding this book. (MLH)

Described is an ongoing study of monozygotic and dizygotic twins, separated in infancy and reared apart. Discussed are the procedures and results of this study with interpretations of the results. The effects of parenting, education, and other interventions are considered. (CW)

The author's purpose in this article is to discuss the aspects of language (especially the development of language in children) to which biological concepts are most appropriately applied. While results of past studies would seem to show that language development is contingent on specific language training, it is important to distinguish between…