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

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

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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.