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An inducible change in state on the chromosomes of Sciara: Its effects on the genetic components of the X

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Abstract

Normally in Sciara males the sex chromosome constitution of the soma (XmO) differs from that of the germ line (XmXp), the single X being of maternal origin. Males which are patroclinous for their sex-linked genes (XpO) are found regularly among the progeny of females heterozygous for any one of a number of X-translocations (X′ Xt). The patroclinous males are almost invariably completely sterile. In the present study a comparison is made of the patroclinous males derived from 5 different X-translocations in S. coprophila. The study includes data on the morphology and sexual behavior of the males as well as the cytology of the testis from late 4th instar through pupal life. The study is oriented towards the basic question of whether the paternally-derived X — normally destined to be eliminated — can function properly when it is retained. The comparative study supports our original suggestion that the patroclinous males arise from no-X eggs following 3∶1 disjunction during oogenesis.

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Authors and Affiliations

  1. Department of Biological Sciences and Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida

    Helen V. Crouse

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  1. Helen V. Crouse
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Dedicated to Professor J. Seiler on the occasion of his 80th birthday.

The studies reported here were supported by the National Science Foundation, grants GB-42 and GB 2857, and in part by Contract No. AT-(40-1)-2690 under the Division of Biology and Medicine, U. S. Atomic Energy Commission.

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Crouse, H.V. An inducible change in state on the chromosomes of Sciara: Its effects on the genetic components of the X. Chromosoma 18, 230–253 (1966). https://doi.org/10.1007/BF00326870

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  • DOI: https://doi.org/10.1007/BF00326870

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