Two genes control seasonal isolation in sibling species.

@article{Tauber1977TwoGC,
  title={Two genes control seasonal isolation in sibling species.},
  author={Catherine A. Tauber and M. J. Tauber and J R Nechols},
  journal={Science},
  year={1977},
  volume={197 4303},
  pages={592-3}
}
Interspecific hybridization tests between Chrysopa carnea and Chrysopa downesi show that single allele differences at two unlinked autosomal loci cause large differences in photoperiodic responses. These differences produce asynchronous seasonal reproductive cycles, thus forming an effective temporal reproductive barrier between the two sympatric species… CONTINUE READING