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Question
During cell division, sometimes there will be failure of separation of sister chromatids. This event is called as
During cell division, sometimes there will be failure of separation of sister chromatids. This event is called as
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Solution
The correct option is C Non-disjunction
Non-disjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. There are three forms of non-disjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II and failure of sister chromatids to separate during mitosis. Non-disjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).
Calvin Bridges and Thomas Hunt Morgan are credited with discovering non-disjunction in the sex chromosome of Drosophila melanogaster, in the spring of 1910.
Thus, the correct answer is option C.
Non-disjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. There are three forms of non-disjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II and failure of sister chromatids to separate during mitosis. Non-disjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).
Calvin Bridges and Thomas Hunt Morgan are credited with discovering non-disjunction in the sex chromosome of Drosophila melanogaster, in the spring of 1910.
Thus, the correct answer is option C.
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