Hybrid zones are often considered natural experiments that test the mechanisms involved in reproductive isolation between species. In collaboration with Ted Case, I am using molecular markers to examine gene flow across two hybrid zones in the whiptail lizard, Cnemidophorus tigris, in Baja California. My mitochondrial sequence data show that narrow hybrid zones currently occur in several regions of the peninsula that were historically inundated by the sea. I am currently quantifying rates of maternal and paternal gene flow across these zones using nuclear microsatellite markers that we have cloned.
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