Trisomy 21 is a consequence of _________________, the unequal distribution of chromosomes during meiosis.
a. crossing over
b. cytokinesis
c. chorionic villus sampling
d. recombination
e. non disjunction
Ans: e. non disjunction
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The chromatids detach from one another and
become visibly separate chromosomes during a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase