Down's syndrome is characterized by _ at chromosome 21.
Correct answer: A. Trisomy
- A. Trisomy
- B. Monosomy
- C. Polysomy
- D. Disomy
Explanation
In Down syndrome, there is an additional copy of chromosome 21, resulting in three copies instead of the normal two. Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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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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