Bridges, Calvin Blackman

Bridges, Calvin Blackman
born Jan. 11, 1889, Schuyler Falls, N.Y., U.S.
died Dec. 27, 1938, Los Angeles, Calif.

U.S. geneticist.

He entered Columbia University in 1909 and assisted Thomas Hunt Morgan in designing experiments using Drosophila that showed that variations in the insect could be traced to observable changes in its genes. These experiments led to the construction of gene maps and proved the chromosome theory of heredity. In 1928 Bridges and Morgan moved to California Institute of Technology, where Bridges continued gene mapping and later discovered an important class of drosophila mutants caused by gene duplications.

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▪ American geneticist
born Jan. 11, 1889, Schuyler Falls, N.Y., U.S.
died Dec. 27, 1938, Los Angeles, Calif.

      American geneticist who helped establish the chromosomal basis of heredity and sex.

      The year after he entered Columbia University (1909), Bridges obtained a position there as laboratory assistant to the geneticist Thomas Hunt Morgan (Morgan, Thomas Hunt). He and Morgan designed experiments using the fruit fly, Drosophila melanogaster (vinegar fly), which showed that heritable variations in the insect could be traced to observable changes in its chromosomes. These experiments led to the construction of “gene maps” and proved the chromosome theory of heredity. Bridges, with Morgan and Alfred Henry Sturtevant, published these results in 1925. That same year he published “Sex in Relation to Chromosomes and Genes,” demonstrating that sex in Drosophila is not determined simply by the “sex chromosomes” (X and Y) but is the result of a “chromosomal balance”—a mathematical ratio of the number of female sex chromosomes (X) to the number of “nonsex” chromosomes (autosomes).

      In 1928 Bridges moved with Morgan to the California Institute of Technology, Pasadena, where he constructed detailed gene maps of the giant chromosomes found in the salivary gland cells of the fruit fly larva. Later he discovered an important class of Drosophila mutants caused by gene duplications.

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Universalium. 2010.

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  • Bridges, Calvin Blackman — (11 ene. 1889, Shuyler Falls, N.Y., EE.UU.–27 dic. 1938, Los Ángeles, Cal.). Genetista estadounidense. Ingresó a la Universidad de Columbia en 1909 y colaboró con Thomas Hunt Morgan en el diseño de experimentos con Drosophila que demostraron que… …   Enciclopedia Universal

  • Calvin Blackman Bridges — Calvin Bridges Pour les articles homonymes, voir Bridges. Calvin Blackman Bridges (11 janvier 1889 27 décembre 1938) était un scientifique américain connu pour ses travaux dans le domaine de la génétique. Il faisait partie de l équipe du prix… …   Wikipédia en Français

  • Calvin Blackman Bridges — (* 11. Januar 1889 in Schuyler Falls, New York; † 27. Dezember 1938, in Los Angeles, Kalifornien ) war ein US amerikanischer Genetiker. Zusammen mit Alfred Sturtevant und Hermann J. Muller gehörte er zur Morgan Gruppe, die gemeinsam im legendären …   Deutsch Wikipedia

  • Calvin — Calvin, Melvin * * * (as used in expressions) Bridges, Calvin Blackman Calvin, Melvin Coolidge, (John) Calvin Klein, Calvin (Richard) Ripken, Cal(vin Edwin), Jr …   Enciclopedia Universal

  • Bridges — Bridges, Robert * * * (as used in expressions) Bridges, Calvin Blackman Bridges, Harry Bridges, Robert (Seymour) Natural Bridges National Monument …   Enciclopedia Universal

  • Calvin Bridges — Pour les articles homonymes, voir Bridges. Calvin Blackman Bridges (11 janvier 1889 27 décembre 1938) était un scientifique américain connu pour ses travaux dans le domaine de la génétique. Il faisait partie de l équipe du prix Nobel de médecine… …   Wikipédia en Français

  • Calvin — /kal vin/, n. 1. John (Jean Chauvin or Caulvin), 1509 64, French theologian and reformer in Switzerland: leader in the Protestant Reformation. 2. Melvin, 1911 97, U.S. chemist: Nobel prize 1961. 3. a male given name: from a Latin word meaning… …   Universalium

  • Calvin Bridges — Calvin Blackman Bridges (January 11 1889 December 27 1938) was an American scientist, known for his contributions to the field of genetics. Along with Alfred Sturtevant and H.J. Muller, Bridges was part of the famous fly room of Thomas Hunt… …   Wikipedia

  • Calvin Bridges — Calvin Blackman Bridges (* 11. Januar 1889 in Schuyler Falls, New York; † 27. Dezember 1938, in Los Angeles, Kalifornien ) war ein US amerikanischer Genetiker. Zusammen mit Alfred Sturtevant und Hermann J. Muller gehörte er zur Morgan Gruppe, die …   Deutsch Wikipedia

  • Bridges — is the plural form of Bridge.PeopleBridges is the family name of:* Alicia Bridges, American singer * Angelica Bridges (born 1971), American actress, model and singer * Barry Bridges (born 1941), English footballer * Beau Bridges (born 1941),… …   Wikipedia

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