We have chromosome 14 and so this chromosome pair right here and chromosome pair 21. Now, what do we mean by chromosomal translocation? So what chromosomal translocation means is a segment of one chromosome. So in this case, a segment of chromosome 21 basically detaches and moves on to this non homologous chromosome. So remember, these are non homologous chromosomes with respect to one another. So we have a breakage of a segment of that DNA take place here and this basically moves on to this chromosome right over here.