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Portrays the role of developmental genetics in dealing with ways phenotypes come into being through the action of genes. Presents a complete discussion of the Creeper domestic fowl--its genetic basis, morphology, embryological history, and the experimental work that led to an understanding of how this gene affects early development to produce the morphological features seen as the outcome of the developmental process. Lecture given by Dr. L. C. Dunn.
Describes the ways in which genes produce phenotypic differences by acting very early in embryonic development. Shows that this action may take place at a distance through chemical messengers (pituitary dwarfism in the house mouse, lethal giant larva in Drosophila), or it may involve tissue induction systems (Brachyury and taillessness in the house mouse). Discusses the development of eye color in Drosophila as a model of how each of the steps in a chain of chemical processes leading to development is under genic control. Lecture given by Dr. L. C. Dunn.
Presents, through animation, an overview of the dinosaur age, showing the major types of dinosaurs and some of their behavioral characteristics. Explains that dinosaurs become extinct because of their inability to catch food. Records how some dinosaurs changed their eating and living habits to adapt to the changing surface of the earth.
Portrays the nature and the role of the Distributive Education Program in the state of Virginia in preparing students for possible future jobs. Shows ow personality traits of an individual provide the basis upon which distributive education training can be pursued and depicts the duties of the distributive education coordinator and the activities of the distributive education clubs.
Technique of drilling and tapping blind holes in cast steel on a radial drill. A drill jig with loose bushings is used for locating the holes. Setting up the work on the table of the machine, setting the jig on the piece to the layout lines. Calculating the size of the tap drill and the method used when setting the machine to drill a number of holes to the same depth. A wizard drill chuck is used in the drilling operation, and a standard friction chuck for holding the tap. The action of a tap in a hole is shown in animation and the reason why a tap binds in the hole and must be reversed frequently when tapping in tough metals.
Stresses that the obligation of each hospital corpsman in the Navy is to be cheerful and make each patient comfortable. Demonstrates an alcohol rub which will prevent pressure sores.
Illustrates abnormalities in gait caused by pain, structural defects and deformities, neuromuscular disorders, and a combination of these causes. Details technical symptoms of the gait and posture resulting from poliomyelitis, spastic paralysis, hypotrolic muscular dystrophy, distonia musculora, and dislocation of the hip, indicating the results of the Trendenburg, flexion, and other tests. Presents Dr. William T. Green of Harvard Medical School providing the narration for the examples and conducting the physical examination for each case stressing that careful observation of the gait is one of the key factors in diagnosis.
Shows some properties that distinguish gases. The volume of ammonia and hydrogen chloride that combine are measured quantitatively, and simple integer volume ratios are measured for the combinations of hydrogen and chlorine. Interprets these simple integer ratios in terms of Avogadro's hypothesis.
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. Illustrates bombardment of fruit flies with X-ray and shows some of the obvious mutations produced in these fruit flies. Pictures a schematic model of the DNA molecule and presents questions concerning its structure, organization, and duplication. Uses animation to picture basic discoveries of inheritance.
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 of the nation.