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The Journal of Heredity 1983:74(3):145-148
© 1983 The American Genetic Association 74:145-148

research-article

Origin of X/O progeny from crosses of sex-ratio trait males of Drosophila pseudoobscura

Julie Henahan, and Gary Cobbs

Department of Biology, University of Louisville Louisville, KY 40292

Abstract

Males of Drosophila pseudoobscura carrying the sex-ratio chromosome (SR) were studied to determine the cause of X/O male progeny that they produce. it was found that among 3671 X/O progeny virtually all resulted from nullo-X sperm. The experiment also revealed a dramatic clustering of the frequency of X/O progeny among SR/Y males. This is interpreted to indicate that premeiotic events in the male germ line are the cause of nullo-X sperm.


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