Which Genetic or Chromosomal Abnormality Below Is Correctly Matched with Its

Multiple Choice

Which genetic or chromosomal abnormality below is correctly matched with its description?

A) In phenylketonuria the child is unable to produce a critical enzyme,which results in an accumulation of poisons,and in turn causes mental retardation.
B) In Tay-Sachs disease,the body starts producing abnormally shaped red blood cells.
C) In Down syndrome,the brain tissues of the cortex degenerate,resulting in the death of the child.
D) In sickle-cell anemia,the child receives an extra chromosome resulting in mental retardation.