Multiple Choice
The best known chromosomal abnormality associated with mental retardation is __________; the most common type of this abnormality is __________.
A) Fragile X syndrome; trisomy 21
B) Tay-Sachs disease; trisomy 21
C) Down syndrome; trisomy 23
D) Tay-Sachs disease; trisomy 23
E) Down syndrome; trisomy 21
Correct Answer:

Verified
Correct Answer:
Verified
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