The success of mutation.

Presented by Dr. David Suzuki, University of British Columbia. (This series was broadcast with the following episode titles but marketed with an alternative set of titles, shown in brackets) "The Success of Mutation" ("Evolution") Mutations ensure survival of species: cactus, Hawaii. Human gene mutation to fight malaria parasite - now results in sickle cell anaemia; double copying of DNA - cow's double stomach; puzzle of "junk" DNA.