English: Phylogenetic signature to distinguish sympatric speciation from reinforcement. Stronger pre-zygotic isolation (indicated by the red boxes and associated arrows) should be detected between Z and Y and between Z and X if species Z sympatrically speciated (green) from the common ancestor of species Y and X. If Z, Y, and X speciated allopatrically (blue), with Z and Y experiencing secondary contact, strong pre-zygotic isolation should be found between Z and Y, but not between Z and X.[1]
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↑Mohamed A. F. Noor (1997), “How often does sympatry affect sexual isolation in Drosophila?”, in The American Naturalist, volume 149, issue 6, DOI:10.1086/286044, pages 1156–1163
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