From the standpoint of classical genetics one of the biggest problems about sex is that it appears not to convey any evolutionary advantage. So there must be more going on than just classical genetics. Mathematical models help biologists to work out why, and when, sex can be a good thing.
Ian Stewart read Mathematics at Churchill College, Cambridge before completing his doctorate at the University of Warwick where he is now a Professor of Maths. He was the first recipient of the Christopher Zeeman medal and has held visiting professorships in the United States, Germany and New Zealand. He has given the Royal Institution Christmas lectures and is a fellow of the Royal Society. He was the Gresham Professor of Geometry between 1994 and 1998.