Chromosome Addition and Subtraction

Duration: 33

Year Published: 1959

Creator: University Film Producers Assn

Format: 16mm

Color: B&W

Description: Describes the polypoid nature of larval salivary cells of Drosophilia and certain human cells. Discusses non-disjunction as a mechanism for the addition and subtraction of single whole chromosomes, leading to haplo-IV and triplo-IV Drosophilia and to trisomics and monosomics in Datura. Compares tetraploids to tetrasomics. Explains the genetic basis of Mongolian idiocy. Discusses the consequences of a single break in a chromosome whose broken ends fail to join restitutionally. Lecture given by Dr. H. J. Muller.

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