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Side-by-side comparison of chase-away and runaway sexual selection. The scenario is based on an imaginary species of butterfly. The males are yellow and the females are green. The females lay eggs on a plant with purplish leaves, so they have a sensory bias toward purple. A mutation arises in some males, giving them purple spots on their wings (purple-males). In the text boxes below, text that differs between the boxes is emphasized with CAPITAL LETTERS, (or is in parentheses). Users who prefer to use keyboard controls
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