Physiology & Biochemistry · single question
Most common chromosomal abnormality (trisomy / Down syndrome)?
Show answer and explanation
Correct answer: A. Chromosome 21
- A. Correct. Trisomy 21 (Down syndrome) is the most common viable autosomal trisomy.
- B. Incorrect. Trisomy 12 is not a common viable trisomy.
- C. Incorrect. There is no 'chromosome 23'; humans have 22 autosome pairs plus the sex chromosomes.
- D. Incorrect. Trisomy 8 mosaicism exists but is far less common than trisomy 21.
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