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Q.

Which of the following is not correct with respect to cell cycle of root apical meristem of onion.

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a

The number chromosomes that form the total chromatin in G1 stage is equal to the amount of chromatin formed by same number of chromatids of that stage.

b

The centrioles or centrosome duplicate in S stage of its cell cycle.

c

Its nuclear DNA is doubled by the end of S stage

d

The number of nucleosomes seen at the end of S stage is double the number of nucleosomes seen in G1 stage.

answer is B.

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Detailed Solution

Onion is a monocot and angiosperm. Hence it has no centrosome and can not show centriole division in S phase.
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