26. During meiosis, trisomy 21 can result from what chromosome abnormality?
A.
An extra chromosome 21 from a mutation
B.
An extra chromosome 21 from nondisjunction
C.
An autosomal dominant disorder
D.
A missing chromosome 21 from nondis- junction
Exam No：AP Biology Problem Set 7 Year：2024 Question No：AP Biology2024AP0151
Answer:
B
Knowledge points:
5.1 Meiosis
Solution:
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