Itschier: OK, tell me! Ptashne: At Reed College, in Portland, Oregon, exactly where I was an undergraduate, we had a spellbinding genetics professor named Tahir Rizki, an Indian. As well as the fantastic point about him was he kept speaking concerning the reciprocal crosses, and his eyes would twinkle! Gitschier: What organism are we talking about Ptashne: Drosophila. I then got to spend my senior