Which of the following is a genetic disorder that results from one extra chromosome in each cell during the development of the fetus?
A. Down syndrome
B. Cerebral palsy
C. Congenital heart disease
D. Attention deficit hyperactivity disorder
E. Juvenile rheumatoid arthritis
A. Down syndrome
Down syndrome is a genetic disorder resulting from one extra chromosome in each of the millions of cells formed during development of the fetus. It is the most common chromosomal abnormality in humans.
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