Sexual reproduction allows organisms to mix up their genes and develop new adaptations to survive a harsh and ever-changing environment. Under nutrient-rich conditions, the worm C. elegans is typically asexual, but after enduring several generations of stress, the worms begin to reproduce sexually and release pheromones to appear more sexually attractive to male worms.
Click here for original story, Stressed out worms use epigenetic inheritance to produce more sexually attractive offspring
Source: ScienceDaily