Alternative Strategies: The Evolution of Switch Points Derek A. Roff  Current Biology  Volume 21, Issue 8, Pages R285-R287 (April 2011) DOI: 10.1016/j.cub.2011.03.016 Copyright © 2011 Elsevier Ltd Terms and Conditions

Figure 1 Wing dimorphism in the sand cricket. Wing dimorphism is an example of variation generated by a threshold trait. The long-winged, flight capable morph on the left possesses both large, functional wings and the associated flight musculature and flight fuels, whereas the flightless, short-wing morph on the right lacks the flight musculature and invests more in reproduction rather than flight fuels. Current Biology 2011 21, R285-R287DOI: (10.1016/j.cub.2011.03.016) Copyright © 2011 Elsevier Ltd Terms and Conditions