Biology
NULL
Medium
Question
Trisomy 21 is most common in mothers of the ________ age group.
A
15 to 19
B
20 to 34
C
35 to 39
D
40 to 45
✓ Official correct answer
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A
15 to 19
No member explanations yet for this option.
B
20 to 34
No member explanations yet for this option.
C
35 to 39
No member explanations yet for this option.
D
40 to 45
No member explanations yet for this option.
Explanation
The risk of trisomy 21 (Down syndrome) increases significantly with advancing maternal age, with mothers in the 40 to 45 age range having a substantially higher per-pregnancy risk compared to younger mothers.