Describes the rapid advance of molecular genetics over the past 20 years that have accounted for the origin of mutations. This research has revealed that variation within species is much greater than Darwin postulated. (Author/MA)

Traces the evolution of unicellular organisms to the multi-cellular plants and animals in existence today. Major events are depicted in a geologic timetable. Organisms, extinct and recent, are classified by taxonomic group. (MA)

Traces the history of evolution theory from Lamarck and Darwin to the present. Discusses natural selection in detail. Suggests that, besides biological evolution, there is also a cultural evolution which is more rapid than the former. (MA)

Geneticists discuss the Jensen paper and suggest upon reviewing the evidence, that the question of genetic differences between the IQ of blacks and whites cannot be answered in the present circumstances. (DM)

Presents current findings and theories on the causes of Down Syndrome. Reviews research which focused on chromosome 21 and the pathologies associated with it. (ML)

Discusses a single pattern formation mechanism that could underlie the wide variety of animal coat markings found in nature. Presents the results of a mathematical model for how these patterns may be generated in the course of embryonic development. (CW)

Focuses on disorders of the human brain, their causes, and the relationship between environmental and genetic factors. (Author/SA)

Presented are the three main theories that describe the pattern of evolution of geographic variants of H. sapiens--the multiregional model, the out-of-Africa model, and the gene-flow or hybridization model. The contributions of geneticists, paleoanthropologists, and the history of fossils are included. (KR)