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  4. During cell division, sometimes there will be failure of separation of sister chromatids. This event is called

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Q. During cell division, sometimes there will be failure of separation of sister chromatids. This event is called

NTA AbhyasNTA Abhyas 2020

Solution:

The separation of homologous chromosomes during meiosis or sister chromatids during mitosis is called a disjunction.
Separation of sister chromatids takes place during anaphase, while in meiosis separation of homologous chromosomes take place during anaphase-I.
When disjunction fails during meiosis, the gametes thus formed have a number of chromosomes more or less to the genome set.
Non-disjunction causes aneuploidy.