Selection, genetic death, and genetic radiation damage

Duration: 1065

Genre: Educational

Year Published: 1959

Creator: Calvin Productions Inc.

Format: 16mm

Color: B&W

Sound: sound

Description: Portrays the frequency of a mutant in the gene pool as reaching a state of equilibrium when, per generation, its origination by mutation equals its elimination by genetic death. Discusses genetic death and presents examples of how genetic loads are changed subsequent to radiation exposure. Pictures the great majority of mutants as harmful when homozygous, but some cases, as in sickle call anemia, heterozygotes are adaptively superior to normal homozygotes. Explains balanced polymorphism, by which a gene is retained in the population despite its lethality when homozygous because of the advantage it confers when heterozygous. Lectures given by Dr. Thomas Dobzhansky., P: Preservation Material NP: Negative Picture AC: Acetate B: 800' 16/8/9.5mm 16mm Black & White Sound 1065 Calvin Productions, Inc. McGraw-Hill Text Films

Complete Record: Portrays the frequency of a mutant in the gene pool as reaching a state of equilibrium when, per generation, its origination by mutation equals its elimination by genetic death. Discusses genetic death and presents examples of how genetic loads are changed subsequent to radiation exposure. Pictures the great majority of mutants as harmful when homozygous, but some cases, as in sickle call anemia, heterozygotes are adaptively superior to normal homozygotes. Explains balanced polymorphism, by which a gene is retained in the population despite its lethality when homozygous because of the advantage it confers when heterozygous. Lectures given by Dr. Thomas Dobzhansky., Selection, Genetic Death, And Genetic Radiation Damage. Calvin Co. 29 Min., Sd., B&W, 16 Mm. © Calvin Co.; 29apr60 (In Notice: 1959); Mp10680. NOTE: Two (or more) records have been merged together to create this data.