Match the following:
| Column – I | Column – II |
| A. Down’s syndrome | 1. Trisomy of sex chromosome |
| B. Patau’s syndrome | 2. Trisomy of 18th chromosome |
| C. Edward’s syndrome | 3. Trisomy of 13th chromosome |
| D. Klinofelter’s syndrome | 4. Trisomy of 21st chromosome |
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