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Option 4 : None of I, II and III
| Disease | Reason | Symptom |
| Down's Syndrome | It happens when an extra chromosome is added to the 21st autosomal chromosome. | The person becomes Mangolian. |
| Patau's Syndrome | It is caused due to the addition of an extra chromosome in the 13th chromosome. | There is a cut mark in the lips and the person is mentally retarded. |
| Sickle Cell Anaemia | It happens due to the change in the 11th autosomal chromosome | Since erythrocytes are destroyed rapidly, it leads to anaemia. |
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