Sure, the parents will have influence. And they will get their information from the culture -- lamarckian evolution, if you want.<p>(Edit: One thing everyone do seem to agree on -- humans are hard wired genetically to get most of our behaviour from culture.)<p>In vivo means &quot;In the living body&quot;. The 2nd and 3rd paragraphs were about what could be done if it was hard to modify existing bodies. (Sorry if I was unclear.)<p>About modifying the genome safely at all -- see the Iceland project.