在过去的半个多世纪里,科学家们一直试图解开一个与传统遗传规律背道而驰的遗传现象—在某些物种中,来自父母一方的一个等位基因能够使来自另一方的等位基因产生变异。作为对孟德尔遗传法则的一种挑战,这一问题自上世纪50年代被提出以来,科学家们就期待在分子水平上解释这一奇怪效应。如 For more than half a century scientists have been trying to unravel a genetic phenomenon that runs counter to traditional genetic laws - in some species, one allele from one of the parents can mutate the allele from the other . As a challenge to Mendelian genetic law, the question has been raised since the 1950s and scientists are expected to explain this strange effect at the molecular level. Such as