Multiple Choice
In about 95% of Down syndrome cases, the extra 21st chromosome exists because
A) of a duplication error during mitosis.
B) of injury that occurs during amniocentesis.
C) the zygote becomes separated and divides into two zygotes.
D) the 21st pair of chromosomes did not separate properly when the egg was formed.
Correct Answer:
Verified
Correct Answer:
Verified
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