Apple flies have fascinated scientists right from the mid-19th century, as they are a captivating example of speciation, the beginning of a new species. Correspondence between Charles Darwin and Benjamin Walsh, who observed the apple flies and hawthorn flies in North America, began the rich history of this scientific question in evolutionary biology. When settlers in North America introduced apple trees to the region, what happened within the hawthorn flies to make them shift to this new host plant in the last 300 years?
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Source: Phys.org