When all individuals in a population are identical with regard to a particular phenotypic trait they are known as monomorphic. When the individuals show several variants of a particular trait they are said to be polymorphic.
'Most of the Gene Pool of the British Isles Is Very Ancient. It Has Nothing to Do with Celts or Anglo-Saxons . . .'
Jan 16, 2007; Byline: By Catherine Jones, Molly Watson and Rin Simpson Western Mail New DNA research claims we may have more in common with the...