Two implanted slide techniques are described by which activity of proteolylic bacteria and the growth of algae in the soil can be readily studied by school students using simple apparatus and methods. Variations are suggested for studying the effects of agricultural practices and environmental conditions on the soil bacteria and algae. (Author/DS)

Describes a game that illustrates the principles of population genetics and helps explain the occurrence of evolution through changes in gene frequencies. Demonstrates the importance of genetic variability in evolution: winning is achieved by a player's species becoming "completely heterozygous" for six characteristics. Players move directed by…

Presented is an approach to the teaching of biological diversity using the theme of survival. Teaching methods for this approach and the advantages of its use are discussed. A suggested course outline is included. (CW)

Described is an activity designed to allow students' thinking about taxonomy to evolve in the same fashion as the thinking of taxonomists. Presented are the problem to be investigated, procedures, and questions for discussion. (CW)

Presented is a cytogenic technique which enables students to produce preparations of dividing cells. Described are materials, methods, typical results, and assessment for this activity. The usefulness for a wide range of ages and abilities is stressed. (CW)

Discussed are problems revealed in student responses to a practical task which formed part of an advanced level examination. The frequencies with which some misconceptions about cell reproduction and genetics occurred are presented. The nature of these misconceptions is analyzed and their implications discussed. (CW)

Described is an activity in which the interactions between a parasite and its host may be demonstrated using the relationship between yogurt and two species of bacteria. Background information on Koch's postulates is provided. Materials, laboratory procedures, and results are discussed. (CW)

Described is an investigation of the contributions of genes and environment to a quantitative character using readily available varieties of dwarf beans. Included are a list of materials, typical results, and a student instruction sheet. (CW)

Described is an experiment which investigates the reciprocal changes in both rats and their handlers during handling. Included are questionnaires, procedures and a description of materials. Probable results are discussed. (CW)

An activity that can be used to teach plant nutrition and the use of hydroponics is presented. Materials and procedures are discussed. Possible topics for science projects are suggested. (CW)

Reviewed are four computer software packages including "Project Classify: Mammals,""Living Science Textbook--The Frog,""Life Science Help Series," and "Talking Dinosaurs." Discussed are availability, features, strengths, and weaknesses. (CW)

Described is the evaluation of an inservice course on biotechnology. Evaluated were the influence that the course had on teacher knowledge, use of practical work, problem solving investigations and theoretical aspects of biotechnology. A practical model of inservice evaluation is provided. (Author/CW)

Plant material can be used for classroom investigations of factors influencing infection. Plant responses to infection can be used as teaching models for animal as well as plant diseases. Three activities are discussed. (Author/CW)

Describes an effort to provide students in an introductory human anatomy course with an experience that both allows them to be creative with the facts they are learning and to be supported throughout the writing process. (ZWH)

Provides a graphing exercise designed to help students understand the coevolution of the physical environment and the biosphere during the last four billion years of Earth's history. The ideas are based upon the Gaia theory, which is the belief that the Earth is a self-regulating network of interdependent physical and biological systems. (ZWH)