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81. Genetic loads in Mendelian populations (28:43)

Date:: 1959
Summary:: 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...

82. Genetic Variability (30:21)

Date:: 1962

83. Genetics of Mendelian populations (29:49)

Date:: 1959
Summary:: 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...

84. Geografia de Sud America : los cinco paises del norte (11:18)

Date:: 1959
Summary:: 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,...

85. Geography of Australia (10:01)

Date:: 1950
Summary:: 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...

86. Geological influences on local plant distribution (16:55)

Date:: 1958
Summary:: 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...

87. Germfree animals in medical research (19:22)

Date:: 1960
Summary:: **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...

88. Getting ready emotionally (11:04)

Date:: 1951
Summary:: 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...

89. Geyser melodies (11:20)

Date:: 1954
Summary:: Uses scenes of the geyser area of Yellowstone National Park to portray today's remnents of the earth's activities during formation. Introduces the theme that man has arrived too late to see more th...

90. Girl Scouting returns to Japan (11:00)

Date:: 1949
Summary:: Shows the revitalization of Girl Scouting in Kyoto, Japan, after World War II. Pictures the girls making straw shoes, working in paper crafts, practicing first aid, celebrating New Year's in a tra...