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Divergence of Meiotic Drive-Suppression Systems as an Explanation for Sex- Biased Hybrid Sterility and Inviability

Steven A. Frank
Evolution
Vol. 45, No. 2 (Mar., 1991), pp. 262-267
DOI: 10.2307/2409661
Stable URL: http://www.jstor.org/stable/2409661
Page Count: 6
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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.
Divergence of Meiotic Drive-Suppression Systems as an Explanation for Sex- Biased Hybrid Sterility and Inviability
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Abstract

Two empirical generalizations about speciation remain unexplained: the tendency of the heterogametic sex to be sterile or inviable in F1 hybrids (Haldane's rule), and the tendency of the X chromosome to harbor the genetic elements that cause this sex bias in hybrid fitness. I suggest that divergence of meiotic drive systems on the sex chromosomes can explain these observations. The theory follows from two simple facts. First, sex chromosomes are particularly susceptible to the forces of meiotic drive. Second, divergence of meiotic drive systems can cause hybrid sterility and inviability. The main objection to the theory is that meiotic drive is apparently rare, whereas the observed pattern of hybrid fitness is widespread. I answer this objection by showing that divergence of meiotic drive systems can explain the two generalizations even if large departures from Mendelian segregation are rarely observed.

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