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High Frequency of One Element of Segregation Distorter in Natural Populations of Drosophila melanogaster

Daniel L. Hartl and Nancy Hartung
Evolution
Vol. 29, No. 3 (Sep., 1975), pp. 512-518
DOI: 10.2307/2407263
Stable URL: http://www.jstor.org/stable/2407263
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
High Frequency of One Element of Segregation Distorter in Natural Populations of Drosophila melanogaster
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Abstract

Seventy-five second chromosomes extracted from a population of Drosophila melanogaster near Raleigh, North Carolina, were examined for their sensitivity to segregation distorter (SD). The frequency of insensitive chromosomes was 0.48 ± 0.06. Seventeen of the insensitive chromosomes were further analyzed to determine the genetic basis of suppression. Sixteen carried the Responder (Rsp) element of the segregation distorter system. The frequency of this component of the SD system is therefore unexpectedly high. This suggests that segregation distortion may be exerting a marked influence on the genetic structure of the population.

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