Molecular biology: A science of exceptions?
But it seems that as time passes, we also find more and more exceptions to our "rules." Last year, French scientists found that RNA, not just DNA, can pass genetic information from generation-to-generation, contradicting (or at least not conforming to) Mendel's laws. Each day we learn more about the significance of epigenetics, the heritable effects that come not from the sequence of genes but from other characteristics and effects, including environmental ones. And finally, just last week, scientists uncovered that "silent" gene mutations, so-called because they do not affect the sequence of amino acids in a protein and thus were thought to have no effect, actually do have a significant effect on the performance of a protein.
Certainly it's the exceptions that we hear about, but I can't help but wonder if, in the future, we will find that biology presents us with more exceptions than conformers to the rules we think we have found.