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Reviews the contributions of Mendel, the Hertwigs, and Miescher to our understanding of modern genetics. Discusses chromosome chemistry in terms of the cytological distribution of nucleic acids, t...
Presents some of the steps and procedures involved in conducting controlled breeding experiments and shows the results of some genetic crosses. Introduces three important areas of genetic research....
Portrays the frequency of mutants in the population gene pool as dependent upon their rate of origination and selection coefficient. Discusses the population fate of dominant lethals (retinoblasto...
Explains the nature and importance of population genetics. Derives the Hardy-Weinberg equilibrium principle for Mendelian (cross-breeding) populations. Points out that though the Hardy-Weinberg la...
Descusses the economic concepts related to land, climate, and major resources in the countries of Colombia, Venzuela, and the three Guianas. Includes scenes of the people and of their ways of life,...
Describes the physical geography of Australia and some of its natural resources, such as wheat, cattle, wool, and timber. Shows how the use of these natural resources has determined the development...
Shows the geological influence on local distribution of plants in the non-glaciated area of southwestern Wisconsin. Highlights many soil conditions and the variety of plants in their region. Catego...
**WARNING: CONTAINS GRAPHIC IMAGES OF LAB TEST ANIMALS** Illustrates the basic techniques of obtaining germfree environment, germfree animals, and methods of germfree miantenance. Demonstrates the...
Sixth in the "Are You Ready for Service?" series. Shows the emotional stresses that must be faced in military service because of homesickness, having to take orders and responsibilities, and havin...