Explain how does trisomy of 21st chromosome occur in humans. List any

1.	Explain how does trisomy of 21st chromosome occur in humans. List any four characteristic features in an individual suffering from it.
Answer» Down’s syndrome Cause: Additional copy of chromosome number 21 or trisomy of chromosome 21. Symptoms: (i) Short statured with small round head. (ii) Partially open mouth with protruding furrowed tongue. (iii) Palm is broad with characteristic palm crease. (iv) Slow mental development.

Explain how does trisomy of 21st chromosome occur in humans. List any four characteristic features in an individual suffering from it.

Answer»

Down’s syndrome

Cause: Additional copy of chromosome number 21 or trisomy of chromosome 21.

Symptoms:

(i) Short statured with small round head.

(ii) Partially open mouth with protruding furrowed tongue.

(iii) Palm is broad with characteristic palm crease.

(iv) Slow mental development.

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Explain how does trisomy of 21st chromosome occur in humans. List any four characteristic features in an individual suffering from it.

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