Karyotype No %
Regular trisomy 21    
47,XY,+21 12 54.6
47,XX,+21 8 36.4
Translocation DS    
46, XY, +21, rob (21; 21) (q10; q10) 1 4.5
Mosaic DS    
47,XY,+21/46,XY 1 4.5
Total 22 100
No: Number, DS: Down Syndrome
Table 2: Karyotype analysis of 22 Down syndrome cases.