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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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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