What geographical feature was overcome by gene flow, evidenced by adjacent northern populations showing no genetic difference despite the barrier?
Answer
The formidable Rocky Mountains
Although the Rocky Mountains typically represent a substantial physical barrier, genetic analysis indicated that gene flow persisted between certain northern populations separated by this range. The maintenance of gene flow across this barrier was attributed to the effective use of established dispersal corridors. Specifically, the low-elevation Yellowhead Pass was identified as a route that allowed genetic exchange, demonstrating that the functional impact of a physical barrier depends on whether the species utilizes paths around it.
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