<Li> Polyploidy , where there are more than two sets of homologous chromosomes in the cells , occurs mainly in plants . It has been of major significance in plant evolution according to Stebbins . The proportion of flowering plants which are polyploid was estimated by Stebbins to be 30 -- 35 % , but in grasses the average is much higher , about 70 % . Polyploidy in lower plants ( ferns , horsetails and psilotales ) is also common , and some species of ferns have reached levels of polyploidy far in excess of the highest levels known in flowering plants . <P> Polyploidy in animals is much less common , but it has been significant in some groups . </P> <P> Polyploid series in related species which consist entirely of multiples of a single basic number are known as euploid . </P> </Li>
<Li> Polyploidy , where there are more than two sets of homologous chromosomes in the cells , occurs mainly in plants . It has been of major significance in plant evolution according to Stebbins . The proportion of flowering plants which are polyploid was estimated by Stebbins to be 30 -- 35 % , but in grasses the average is much higher , about 70 % . Polyploidy in lower plants ( ferns , horsetails and psilotales ) is also common , and some species of ferns have reached levels of polyploidy far in excess of the highest levels known in flowering plants . <P> Polyploidy in animals is much less common , but it has been significant in some groups . </P> <P> Polyploid series in related species which consist entirely of multiples of a single basic number are known as euploid . </P> </Li>
a karyotype with an extra set of chromosomes indicates
a karyotype with an extra set of chromosomes indicates
Polyploidy
Polyploidy