Describes a science activity on the importance of meiosis for variability. Uses a coin flip to demonstrate the random arrangement of genetic materials and explains how this results in zygotes with a new DNA combination. (YDS)

Presented is a discussion of recent evidence on the evolution of human forms on earth gathered and evaluated using mitochondrial DNA techniques. Theories regarding the possibility that a common female ancestor existed in Africa about 200,000 years ago are discussed. A list of teaching aids is provided. (CW)

Presents insights into the endosymbiotic theory based on a re-examination of evidence from investigations into the archaebacteria and other strange organisms inhabiting the hindguts of wood-eating insects. Examines the mechanism of evolutionary change and the speed with which it occurs. (RT)

Presents a genetic game that allows students to construct a human face as determined by the random selection of alleles from a gene pool. Can be used to teach the concepts of chromosome inheritance, dominance, incomplete dominance, multiple alleles, multiple loci, independent assortment, multiple gene traits, and evolution. (JRH)

Describes the new public television series called "The Secret of Life," and explains how the program can be used in an elementary school classroom. Large color poster is included. (PR)