In the following list, which term is least related to the others? tripled monosomic aneuploid trisomic Solution triploid is the answer. Aneuploidy is the presence of an abnormal number of chromosomes in a cell.It can be monosomic or disomic or trisomic. Monosomy is lack of one chromosome of the normal complement.Monosomy of the sex chromosomes(45,X) causes Turner syndrome. Trisomy is the presence of three copies,instead of the normal two,of a particular chromosome.The presence of an extra chromosome 21,which is found in Down syndrome. Triploid is having three homologous sets of chromosomes..