Down syndrome is also known as trisomy-21 because individuals with Down syndrome ____.
A) have three distinct facial features by the 21st week of pregnancy
B) show three distinct temperament patterns by the 21st week of infancy
C) have a third chromosome on the 21st pair
D) have 21 genes on the 3rd pair of chromosomes
Correct Answer:
Verified
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Q274: What is another name for trisomy-21?
A) non-sex-linked-21
B)
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