Which of the following genetic or chromosomal abnormalities is correctly described?
A. In Down syndrome, the brain tissues of the cortex degenerate, resulting in death.
B. In sickle-cell anemia, the child receive an extra chromosome during conception and, as a result, develop severe mental disabilities.
C. In Tay-Sachs disease, the body starts producing abnormally shaped red blood cells.
D. In phenylketonuria, the body is unable to produce a critical enzyme, which results in an accumulation of poisons that cause profound intellectual disabilities.
Answer: D
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