Origin of Species

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Apple maggot flies may be a case of the beginning stages ofsympatric 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 offspringwith emergence times appropriate for apples or haws.The two races already show some preferences in mating formembers of their own race.16
Anagenesis and cladogenesis combine to produce the diversity oflife. Selection, mutation, genetic drift, etc. cause change within alineage. Isolated populations can become separate evolutionarylineages with their own novelties, and evolutionary future.17
Page 1 and 2: Evolution IIIThe Origin of SpeciesN
Page 3 and 4: The question is sometimes more diff
Page 5 and 6: The biological species concept - a
Page 7 and 8: Ecological isolation occurs whentwo
Page 9 and 10: Temporal isolation occurs when two
Page 11 and 12: Hybrid sterility isolates species.
Page 13 and 14: The geographic isolationmay involve
Page 15: Speciation can also occur within th
Page 19: “Nothing in biology makes senseex

Origin of Species

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