Edward's syndrome characterised by mental deficiency is caused by trisomy of chromosome.

5

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9

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15

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18

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Solution

The correct option is D $18$
Edwards Syndrome (also known as Trisomy 18 (T18) or Trisomy E) is a genetic disorder caused by the presence of all or part of an extra 18th chromosome.

So, the correct answer is '18'.

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Down Syndrome is caused by trisomy of chromosome 21. True or false?

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