Abnormalities of Chromosome number Heteroploid(异倍体) Any chromosome number other than 46 (1) Euploid(整倍体) An exact multiple of the haploid chromosome number (n), where n=23 (2) Aneuploid(非整倍体) Any chromosome number that is not an exact multiple of the haploid number(n)Abnormalities of Chromosome Number • Heteroploid（异倍体） – Any chromosome number other than 46 (1) Euploid （整倍体） – An exact multiple of the haploid chromosome number (n), where n = 23 (2) Aneuploid （非整倍体） – Any chromosome number that is not an exact multiple of the haploid number (n)