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Nabati Nabati
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7 years ago
Down syndrome is caused by
   a. a missing chromosome.
   b. two X chromosomes.
c. an extra 21st chromosome.
   d. the presence of an X and a Y chromosome.
Textbook 
The Dynamic Child

The Dynamic Child


Edition: 1st
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SouthernerSoutherner
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7 years ago
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Nabati Author
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7 years ago
Brilliant ツ
courtneyrmcd
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Yesterday
Thanks for your help!!
Tim0301
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2 hours ago
Smart ... Thanks!
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