DNA getting smaller everytime it replicates?? Today in biology class, my teacher said that DNA gets smaller everytime it replicates. He also said that this is the main cause of aging (he said that the "shortening" of DNA ending up chopping off important genes later in life, which led to an increased probability of diseases like cancer as we age because our cells have divided so many times) Well, I tried to look this up, but I cannot find any information or research about DNA getting smaller after replication. Any idea what he was talking about? If it is true could you point me towards some online reading on the subject?