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NEETBotanyCell Cycle and Cell Division

Read the following statement and choose the option that correctly fills the blanks. In animal cells, the centriole duplicates in the ___(i)___ during the ___(ii)___ phase and begins to move towards opposite poles during the ___(iii)___ stage.

Options

  1. A(i) nucleus, (ii) S, (iii) Prophase
  2. B(i) cytoplasm, (ii) S, (iii) Prophase
  3. C(i) cytoplasm, (ii) G₂ , (iii) Prophase
  4. D(i) cytoplasm, (ii) S, (iii) Metaphase

Correct answer

B. (i) cytoplasm, (ii) S, (iii) Prophase

Step-by-step solution

In animal cells, during the S phase of interphase, DNA replication begins in the nucleus while the centriole duplicates in the cytoplasm. During Prophase, which is the first stage of mitosis, the duplicated centrioles (centrosomes) begin to move towards the opposite poles of the cell. Therefore, the centriole duplicates in the cytoplasm (i) during the S phase (ii) and begins to move towards opposite poles during the Prophase (iii) stage. Options suggesting the nucleus for centriole duplication confuse it with DNA r

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