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Question

Select the correct option:
Read the following statements about cell division and select the correct ones.
(i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases.
(ii) In the 24 hours average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.
(iii) M phase constitutes more than 95% of the duration of cell cycle.

A
(i) and (ii)
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B
(ii) and (iii)
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C
(i) and (iii)
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D
(i), (ii) and (iii)
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Solution

The correct option is A (i) and (ii)
Cell cycle consists of two basic phases, long nondividing I phase and a short dividing M phase . In the average duration of 24 hours in the cell cycle of dividing human cell , M phase lasts for one hour (less than 5% of total) while I phase or interphase occupies 7595% of total generation time.
So, the correct answer is '(i) and (ii)'.

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