Speciation genes depend on insect’s selection

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Article reads: Just two genes orchestrate the annual phlox’s shift from purple to red flowers in the fields where it meets its cousin.  But this color change has a big impact. Like prudish governesses, the genes keep the annual species from mating with the pointed relative, because butterfly pollinators rarely swap pollen between red and purple flowers. Such governesses are an example of what many biologists call speciation genes.

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