Answer Happy

Read the discussion topic and answer the question below. Be sure to follow the directions in the attached Rubric to get full credit. Be sure to give essential background information on Trisomy 21! 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?