Why are individuals with an extra chromosome 21, which causes Down syndrome, more numerous than individuals with an extra chromosome 3 or chromosome 16? a) Extra copies of the other somatic chromosomes are probably fatal. b) There are probably more genes on chromosome 21 than on either chromosomes 3 or 16. c) Nondisjunction of chromosomes 3 and 16 probably occurs more frequently. d) Down syndrome results in more serious symptoms than either trisomy 3 or trisomy 16.

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