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<p>Subsequently, the sub-populations expand within the species larger range, <a href="page.php?w=Hybrid_%28biology%29">hybridizing</a> (with <a href="page.php?w=Sterility_%28physiology%29">sterility</a> of the <a href="page.php?w=offspring">offspring</a>) in narrow hybrid zones. <a href="page.php?w=Douglas_J._Futuyma">Futuyama</a> and <a href="page.php?w=Gregory_C._Mayer">Mayer</a> contend that this form of parapatric speciation is untenable and that <a href="page.php?w=chromosomal_rearrangement">chromosomal rearrangement</a>s are unlikely to cause</p><p>
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