Trisomy 21 is most common in mothers of the ________ age group.
Correct answer: D. 40 to 45
- A. 15 to 19
- B. 20 to 34
- C. 35 to 39
- D. 40 to 45
Explanation
The risk of nondisjunction and therefore trisomy 21 rises markedly with maternal age, with the highest risk among the listed groups at 40 to 45 years. Students may choose 35 to 39 because risk begins increasing substantially after 35, but the older group has the greater incidence.
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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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