The frequency of some alleles continuously rises from North to South in the apple maggot fly. A good illustration of synchronous speciation is this.
When all members of a species are in close proximity to one another and there are no physical obstacles preventing any of them from mating with one another, simultaneous speciation can be seen. A new species may have evolved intuitively in response to a unique food supply or attribute.
The apple maggot fly is a good illustration of a sympatric speciation paradigm in action. In North America, hawthorn is the apple maggot fly's natural host plant. On the other hand, a new population of domesticated apples was introduced in the middle of the 1800s.
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