Biology
Grade-9
Easy

Question

Which of the following genetic disorder is caused due to the presence of an additional chromosome 21?

  1. Down’s syndrome
  2. Turner’s Syndrome
  3. Turner’s Syndrome
  4. Fragile X syndrome

hintHint:

Down's syndrome

The correct answer is: Down’s syndrome


    Most cases of Down syndrome result from trisomy 21, which means each cell in the body has three copies of chromosome 21 instead of the usual two copies.
    Researchers believe that having extra copies of genes on chromosome 21 disrupts the course of normal development, causing the characteristic features of Down syndrome and the increased risk of health problems associated with this condition.

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