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.
O B. In sickle-cell anemia, the child receives an extra chromosome during conception and, as
a result, develops severe mental disabilities.
O C. In Tay-Sachs disease, the body starts producing abnormally shaped red blood cells.
O D. In phenylketonuria, the body is unable to produce a critical enzyme, which results in an
accumulation of poisons that causes profound intellectual disabilities.