Phillip Sharp
"Earlier it was believed that genes evolve mainly through the accumulation of small discrete changes in the genetic material. But their mosaic gene structure also permits higher organisms to restructure genes in another, more efficient way. This is because during the course of evolution, gene segments – the individual pieces of the mosaic – are regrouped in the genetic material, which creates new mosaic patterns and hence new genes. This reshuffling process presumably explains the rapid evolution of higher organisms".