<P> Genetic variation is brought about , fundamentally , by mutation , which is a permanent change in the chemical structure of chromosomes . Genetic recombination also produces changes within alleles . </P>
<P> Genetic variation is brought about , fundamentally , by mutation , which is a permanent change in the chemical structure of chromosomes . Genetic recombination also produces changes within alleles . </P>
the ultimate source of new variation in nature is
the ultimate source of new variation in nature is
mutation
mutation