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Science 14 January 1994:
Vol. 263. no. 5144, pp. 230 - 232
DOI: 10.1126/science.8284674
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Articles

Science, Vol 263, Issue 5144, 230-232
Copyright © 1994 by American Association for the Advancement of Science

articles

Degeneration of a nonrecombining chromosome

WR Rice

Department of Biology, University of California, Santa Cruz 95064.

Comparative studies suggest that sex chromosomes begin as ordinary autosomes that happen to carry a major sex determining locus. Over evolutionary time the Y chromosome is selected to stop recombining with the X chromosome, perhaps in response to accumulation of alleles beneficial to the heterogametic but harmful to the homogametic sex. Population genetic theory predicts that a nonrecombining Y chromosome should degenerate. Here this prediction is tested by application of specific selection pressures to Drosophila melanogaster populations. Results demonstrate the decay of a nonrecombining, nascent Y chromosome and the capacity for recombination to ameliorate such decay.


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