N.Wells

Some of the details are pretty cool. The populations of the butterfly in question are on two adjacent islands. The origin of the suppressor gene is not known but it was absent from both islands in 2001. In 2005 it had taken over one island, but was not yet present on the second island. By 2006 it had become fixed in populations on the near shore of the second island, but had not yet taken over populations on the far side of that island (it seems to be about half-way to fixation there). 1 year = 10 generations for this butterfly, so 0 to 100% in 10 generations. That's a neat pattern of rapid gene flow and geographic spread, and a nice documentation of fast natural selection at work. Also, apparently it fulfills a prediction made by Hamilton in 1967 (that a system of gender-ratio disrupters and disrupter suppressor genes could result in dramatically rapid shifts in gender ratios). The latter is a nice point, if minor, because evolution deniers often claim that biologists never make predictions.

The original paper is at http://www.sciencemag.org/cgi/reprint/317/5835/214.pdf