C. elegans is a good example of this. They have males and hermaphordites, but interestingly enough, the ratios of those two from lab and wild strains differed b

C. elegans is a good example of this. They have males and hermaphordites, but interestingly enough, the ratios of those two from lab and wild strains differed by quite a bit. Turns out, in a stable lab environment, hermaphrodites were more efficient. However, once you started changing the environment populations with males could always adapt faster.