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Title: The extra 21st chromosome that causes Down syndrome is Post by: Auditore on Oct 28, 2017 The extra 21st chromosome that causes Down syndrome is
A) usually provided by the egg. B) usually provided by the sperm. C) provided by the egg about half the time and by the sperm about half the time. D) usually created sometime during prenatal development. Title: Re: The extra 21st chromosome that causes Down syndrome is Post by: JLHC on Oct 28, 2017 Content hidden
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