John Thoday, former professor of genetics at Cambridge University, died at the age of 91, reports this obituary in The Guardian. Thoday's reputation hinged on bringing to prominence the study of genetics, and how genes play equally significant roles in genetic variation and evolution. He built up the department of genetics at Cambridge in the 1960s and 70s, receiving a fellowship to the Royal Society in 1965, and serving as president of the Genetical Society from 1975 to 1977.