THE GENETICS OF HOST SELECTION AND ITS BEARING ON SYMPATRIC SPECIATION IN PROCECIDOCHARES (DIPTERA: TEPHRITIDAE)

The genetics of host selection, in terms of oviposition behavior, was investigated in two species of monophagous gall‐forming flies. The existence of a single major allele difference in the genetic basis of host selection was established by a series of hybrid crosses between these flies. The complimentary role of conditioning was also investigated. The apparently simple genetic change required to produce a change in host selection suggests a mechanism of sympatric speciation applicable to these insects.

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