Question

Which of the following statements about down syndrome is false? a individuals with down syndrome are triploid. b down syndrome occurs due to nondisjunction in either meiotic division in the mother. c most down syndrome births happen to women over age 35. d familial down syndrome is due to nondisjunction. e all of the above are false?

Answer 1

E. All of the above are false.  

In most cases, individuals with down syndrome have 47 chromosomes, with three copies of chromosomes 21.