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Q.

In an onion root tip cell, there are 24 chromosomes. How many chromosomes will be present in the meristematic cells of onion ?
(A) In G1phase
(B) After S phase
(C) After M phase

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a

A - 24 ; B - 24 ; C - 24

b

A - 24 ; B - 24 ; C - 48

c

A - 12 ; B - 24 ; C - 48

d

A - 24 ; B - 48 ; C - 12

answer is A.

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Detailed Solution

chromosome number doubles in anaphase,  till anaphase chromosome number remains same . So that each daughter cell can receive equal number of chromosomes to its parent cell.

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