Apple maggot flies are thought to have evolved from hawthorn flies by sympatric speciation. Hawthorn flies are native to North America. They lay their eggs in the berries of the hawthorn bush. The eggs hatch into maggots and the maggots develop into adult flies. Following the introduction of apple trees to North America, a small group of the hawthorn flies started laying their eggs in the apples. The diagram shows the two types of fruit and the time of year that the fruits are produced. Suggest how these flies became reproductively isolated. Use the information in the diagram to support your answer. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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