Male having Down's syndrome have sex chromosomes:
Correct answer: B. XY
- A. XXY
- B. XY
- C. XYY
- D. XYYY
Explanation
In Down's syndrome, the affected person contains an extra autosomal chromosome number 21 (trisomy 2n+1). Males having this syndrome have XY sex chromosomes. They have 3 21st chromosomes.
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