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Do these data demonstrate that breast colour in barn swallows could have evolved by sexual selection?

April 26, 2017barn breast colour Data demonstrate selection sexual swallows

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Do these data demonstrate that breast colour in barn swallows could have evolved by sexual selection?

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Explain how the data presented do or do not demonstrate that the requirements for sexual selection have been satisfied (see Krebs, p.17 for a review of the requirements for natural selection). Be clear on which data are the strongest or weakest in demonstrating natural selection.