Question: Down syndrome is one of the few genetic conditions involving an
alteration of chromosome number t…


Down syndrome is one of the few genetic conditions involving an
alteration of chromosome number that allows fetal development to be
completed. Nondisjunction of autosomes other than chromosome 21 can
also occur but is rarely seen in full-term infants because of
spontaneous abortions during fetal development.

Why would a child with trisomy 21 be more likely to come to term
than a child with, say, trisomy 3?

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