📊 Biology
Q. Down Syndrome, a congenital genetic disorder in human beings, is caused by:
  • (A) trisomy of chromosome 21
  • (B) a defective recessive gene in homozygous condition
  • (C) trisomy of chromosome 18
  • (D) an extra x chromosome
✅ Correct Answer: (A) trisomy of chromosome 21

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