Nondisjunction in meiosis I vs. meiosis II
Nondisjunction during meiosis I produces which gametes?
Answer C: explanation for every choice
A
Two normal gametes result from nondisjunction in meiosis II, when sister chromatids fail to separate in one cell.
B
Nondisjunction always produces abnormal gametes.
C
Correct. Homologs fail to separate, so one cell gets both and the other gets neither. Every resulting gamete is abnormal.
D
Nondisjunction affects gametes in pairs, so a single abnormal gamete does not occur.
TakeawayMeiosis I error: all four gametes abnormal. Meiosis II error: half are normal.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb57.