Asked by Rylee

#3) A person with trisomy 21 has an extra copy of chromosome 21. What happened during meiosis that caused the person to get three, instead of two, copies of chromosome 21?

A) nondisjunction
B) genetic recombination
C) Binary fission
D) Crossing Over

I'm thinking that sounds like C... but I'm not one hundred percent sure.

Answered by bobpursley
Trisomy 21 (47,XX,+21) is caused by a meiotic nondisjunction event.
Answered by Rylee
oh... okay, thanks
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