Aneuploids Monosomic(2n-1) Nullisomic(2n-2) Trisomic(2n +1) Tetrasomic(2n+2) 2. Origin and Evolution of polyploids Popularity of polyploidy in plant Kindom p 172 50% in angisperm plants被子植物 ab. 70%in grasses (Tab. 10-1, 2 p. 172-173) Natural origination egg(2n)+ Pollen(n)-Triploid-+Tetraploid (unreduced)(reduced) (selfing, backcrossingAneuploids Monosomic (2n-1） Nullisomic (2n-2) Trisomic (2n +1) Tetrasomic (2n+2） 2. Origin and Evolution of Polyploids ▪ Popularity of Polyploidy in Plant Kindom p. 172 > 50% in angisperm plants 被子植物 ab. 70% in grasses (Tab. 10-1, 2 p. 172-173) ▪ Natural Origination Egg (2n) + Pollen (n) Triploid Tetraploid (unreduced) (reduced) (selfing, backcrossing)