Please name any that you find.
What is the scientific name for Down Syndrome?
The 21 in trisomy 21 does NOT indicate an extra Y chromosome. It just indicates an extra chromosome at chromosome 21. Instead of having the normal 2 chromosomes, there are 3 chromosomes at chromosome number 21.
Reply:Down Syndrome or Trisomy 21. An extra "Y" chromosome is the culprit. Discovered by Dr. J. Langdon Down.
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Reply:trisomy 21. (meaning an extra chromosome) Instead of 46 chromosomes a person with down syndrome has 47.
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