Chromosomal-Abnormalities.md

@@ -60,7 +60,10 @@
 </td>
 </tr>
 <tr>
-<td>Down Syndrome (Trisomy 21)</td>
+<td>
+
+[Down Syndrome (Trisomy 21)](https://www.merckmanuals.com/professional/pediatrics/chromosome-and-gene-anomalies/down-syndrome-trisomy-21)
+</td>
 <td>GRCh38 (chr21:add)</td>
 <td>