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Related to parapatric speciation: genetic drift
parapatric speciation[¦par·ə¦pa·trik ‚spe·shē′ā·shən]
Gradual speciation whereby new species are created from populations that maintain overlapping geographic zones of genetic contact.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.