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Home Q & A Board Science-Related Homework Help Psychology
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KaylaMarie2014 KaylaMarie2014
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6 years ago
Down syndrome is caused by
 
  A) improper migration of brain cells during brain development.
  B) an inherited faulty gene.
  C) a genetic error in which a vital enzyme is missing in the brain.
  D) the presence of an extra twenty-first chromosome.
  E) obstetric difficulties at the time of birth.
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ch102ch102
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6 years ago
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KaylaMarie2014 Author
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6 years ago
Thanks
ky
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Yesterday
Smart ... Thanks!
sleinhi
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2 hours ago
You make an excellent tutor!
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