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Discusses the effect of various levels of inbreeding (self-fertilization, sib matings, half-sib matings, cousin marriages) upon making heterozygous genes homozygous with the consequent loss of vigor. Presents data for the increased risk of genetic defect from cousin marriage in studies of phenylketonuria, of a Japanese population and a French population. The concept and estimation of lethal equivalents are given. Shows how increases in heterozygosity increase vigor (heterosis); hybrid vigor in corn in described in detail. Lecture given by Dr. J. F. Crow.
Shows how to plan the job; how to use molding raceway fittings; how to install a molding raceway run to a ceiling outlet; how to install a run from a ceiling outlet to a wall switch; how to install a run from a ceiling outlet to a wall fan; and how to install a run to a floor outlet.
Demonstrates use of standard error, comparison of scores with test norms in interpretation of test scores, and use of percentile bands rather than points. | Presents a lecture by Dr. Scarvia B. Anderson, who demonstrates two important principles of test interpretation--(1) any test score is only an estimate of a student's ability, and (2) percentages are meaningful only if the characteristics of the group on which norms are based are known. Golf pro Ernie Pognotta helps to show similarities in basic principles of measurement in golf and in test scores. Dr. Anderson emphasizes that meaning comes from comparison in interpreting test scores.
Uses animation to compare written music symbols with written words and emphasizes that music is a written language with its own symbols. Introduces the five-line staff and the G clef as the basic structures upon which music is written. Shows how to develop pitch memory, introduces a basic rhythmic and tonal vocabulary, and combines these vocabularies into songs.
Uses animation and laboratory demonstrations to explain the formation of ions in ionization and the effects ions produce. Presents hydrochloric acid as a typical electrolyte that ionizes in water permitting the solution to conduct an electric current. The polarity of the water molecule is illustrated and valance, electrovalance, and the effect of ionization on the boiling and freezing points of solutions are explained.
This older film is directed to young girls. Using diagrams, it helps them learn about menstruation and gives them a healthy understanding of the physical and emotional changes that occur in growing up.
Tells the story of a boy's trip to visit friends in Costa Rica. He lives in the home of an upper-class Costa Rican family, sharing their life and activities. He goes to see the public schools, the city market, native animals in the zoo, and the large plantations. Emphasizes the similarities and differences between life in Costa Rica and the United States.
Explains the principles and demonstrates procedures and materials for joining and gluing wood, emphasizing the mortise-and-tenon and edge-to-edge joints. Shows procedures for application of glue and the use of clamping tools in gluing.
Shows the economic life and activities of the people in the Kunming area of Yunnan Province, at the end of the Burma Road. Pictures agriculture, transportation, conditions of life, and the methods of labor and industry of the people in this congested area. Contrasts the lot of the worker and peasant, who uses outmoded methods and gains a pitiful living, with the life of the people in the cosmopolitan center of Kunming.
A story about a Mexican boy and his donkey is used in depicting the characteristics of rural life in Mexico and in emphasizing the importance of helping others. Educational collaborator, William G. Brink.