Origin of Species
Origin of Species
Origin of Species
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Apple maggot flies may be a case <strong>of</strong> the beginning stages <strong>of</strong>sympatric speciation.The apple race emergesearly and parasitizes apples.The Haw race emerges lateand parasitizes haws. Anymating between a late appleApple race Haw racefly and an early haw fly willproduce hybrids with anintermediate emergence timewith few opportunities forparasitism.Those that avoid mating with the other race will produce <strong>of</strong>fspringwith emergence times appropriate for apples or haws.The two races already show some preferences in mating formembers <strong>of</strong> their own race.16
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