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The Creation of Sexual Isolation by Artificial Selection

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Two laboratory strains of D. melanogaster - Ore R marked with the recessive stw and Florida marked with the recessive se -- were carried in a mixed population through 33 generations. In each generation the percentage of stw, se, and wild-type flies was determined; the wild-type flies were discarded, and the next generation set up with equal numbers virgins of the two recessive strains. In spite of a contamination which brought in double recessive phenotypes from generation 16 on, the percentage of wild type flies declined significantly during the experiment. Multiple choice tests made with control and population flies as … continued below

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14 pages

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King, James C.; Wallace, Bruce. & Wright, Theodore R. F. August 1, 1952.

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Two laboratory strains of D. melanogaster - Ore R marked with the recessive stw and Florida marked with the recessive se -- were carried in a mixed population through 33 generations. In each generation the percentage of stw, se, and wild-type flies was determined; the wild-type flies were discarded, and the next generation set up with equal numbers virgins of the two recessive strains. In spite of a contamination which brought in double recessive phenotypes from generation 16 on, the percentage of wild type flies declined significantly during the experiment. Multiple choice tests made with control and population flies as well as tests of the off-spring of single females taken from the population indicated a definite change in sexual behavior as a result of the experiment. Taken together, the data support the conclusion that each strain carried within it heritable individual differences in sexual behavior and that selection shifted the mean behavior of the two strains interacting in a mixed population.

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14 pages

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Digitized from microopaque cards (1).

Includes bibliograpic references (pages 10-11)

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  • Report No.: AECU-2215
  • SuDoc Number: Y 3.At 7:22/AECU-2215
  • Accession or Local Control No: metadc1240607
  • Archival Resource Key: ark:/67531/metadc1240607

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TRAIL Microcard Collection

Imaged from microcard, these technical reports describe research performed for U.S. government agencies from the 1930s to the 1960s. The reports were provided by the Technical Report Archive and Image Library (TRAIL).

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  • August 1, 1952

Added to The UNT Digital Library

  • Nov. 5, 2023, 7:58 a.m.

Description Last Updated

  • Nov. 12, 2025, 12:26 p.m.

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King, James C.; Wallace, Bruce. & Wright, Theodore R. F. The Creation of Sexual Isolation by Artificial Selection, report, August 1, 1952; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1240607/: accessed January 22, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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