It may be that Lemarkism may be alive and well in a sense as shown in this article studying epigenetic influences in plants. Simple changes in DNA, adding a methyl group at a prescribed point allows for changes required by environmental challenges. Purposeful, not random. Not exactly how Darwin imagined it, but he couldn't have at his point in time. http://www.nature.com/news/2009/090129/full/news.2009.67.html - This just reinforces the point I have made in the past that small segments of RNA are the workhorses of DNA regulation.