Write about chromosomal complement, cause and symptoms of Down's syndrome.

Explanation

Down's syndrome is called mongoloid idiocy or 21st trisomy. It is due to autosomal hyperploidy se... trisomy in the 21st pair where the chromosomal complement is 45AA + xy for males and 45AA + xx for females.
Symptoms include:
1. Flattened nose.
2. Protruding tongue.
3. Upward slanting eyes.
4. Epicanthal fold (inner corner of eyes may have a rounded fold of skin).
5. Hands are short and broad with short fingers.
6. Hypotonia (Low muscular strength in infants).
7. Short stature.
8. Small or malformed cars.
9. Mental dullness.