Over the course of only half a century, genetic engineering has developed from an intellectual concept to a medical reality. Yet the ethical and moral questions underpinning it remain unanswered.

Genetically modified crops, illegal human experimentation, and a handy hip-hop analogy - Dallas is joined by Dr Adam Rutherford (The Curious Cases of Rutherford & Fry, BBC R4) to help dig into the story of this invention, that is still, very much in progress.