According to a story at SciScoop, some plants apparently keep a “backup copy” of grandparents’ DNA, and can “restore” to avoid adverse genetic traits inherited from both parents.

Contrary to inheritance laws the scientific world has accepted for more than 100 years, some plants revert to normal traits carried by their grandparents, bypassing genetic abnormalities carried by both parents.

These mutant parent plants apparently have hidden templates containing genetic information from the preceding generation that can be transferred to their offspring, even though the traits aren’t evident in the parents

Needless to say, this has caused some consternation in certain circles where such things were thought to be impossible.