Nondisjunction is the failure of chromosomes (or sister chromatids) to separate properly during meiosis. It results in gametes with
- Acheck_circle
Abnormal chromosome counts (aneuploidy)
- B
The normal haploid chromosome number
- C
Twice the diploid chromosome number
- D
No chromosomes at all (empty gametes)
Explanation
Nondisjunction in meiosis I (homologs) or II (sisters) creates gametes with extra or missing chromosomes (e.g., trisomy 21).