Theories of Development

Duration: 33

Format: 16mm

Color: Color

Description: Uses the frog to show development from egg to adult and traces the history of explaining development from Aristotle to the present day. Views the dissection of male and female frogs and describes the functions of their reproductive glands. Demonstrates the action of the pituitary gland as a stimulator to the female and then, covering eggs with a sperm suspension, shows their normal development. Pictures through time-lapse photography the progression of gastrulation. Outlines the history of explaining development from Aristotle's ideas of preformation and epigenesis through the work of W. Roux, H. Driesch, and H. Spelmann. Concludes with the concepts explaining development that are held by scientists today.

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Indiana University Library Moving Image Archive

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Original permalink · Record added: 2024-04-22 21:32:03