NEET 2013 · Class 11

Cell Cycle and Cell Division

[DIAGRAM: A cell in metaphase of mitosis showing two centrosomes at opposite poles, spindle fibres attached to kinetochores, and chromosomes aligned at the equatorial plane.] A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics?

  1. (A)Metaphase - Spindle fibers attached to kinetochores, centromeres split and chromatids separate.
  2. (B)Metaphase - Chromosomes moved to spindle equator, chromosomes made up of two sister chromatids.
  3. (C)Anaphase - Centromeres split and chromatids separate and start moving away.
  4. (D)Late prophase - Chromosomes move to spindle equator.

The NCERT line that answers it

Verbatim line

Hence, the metaphase is characterised by all the chromosomes coming to lie at the equator with one chromatid of each chromosome connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole (Figure 10.2 b).

Chapter
Cell Cycle and Cell Division
Section
10.2.2 Metaphase
Page
3
Words matched
71 of 71

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

6667, emb=1.0, combined=0.8667). Verified: high — The NCERT span explicitly states 'the metaphase is characterised by all the chromosomes coming to lie at the equator' and describes chromosomes with sister chromatids connected to spindle fibers from opposite poles, which directly matches option B's description of metaphase with chromosomes moved to spindle equator and made up of two sister chromatids.

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