Genetic self-correction?

[zalena]

In a startling discovery, geneticists at Purdue University say they have found plants that possess a corrected version of a defective gene inherited from both their parents, as if some handy backup copy with the right version had been made in the grandparents' generation or earlier.

http://www.nytimes.com/2005/03/23/science/23gene.html?incamp=article_popular_2

A very interesting article, with fascinating implications.