NEET 2012 · Class 11

Cell Cycle and Cell Division

[DIAGRAM: Two homologous chromosomes undergoing crossing over, showing exchange of segments between non-sister chromatids.] The given figure is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

  1. (A)Prophase I during meiosis
  2. (B)Prophase II during meiosis
  3. (C)Prophase of mitosis
  4. (D)Both prophase and metaphase of mitosis

The NCERT line that answers it

Verbatim line

In the first meiotic division the homologous chromosomes pair to form bivalents, and undergo crossing over.

Chapter
Cell Cycle and Cell Division
Section
10.5 SIGNIFICANCE OF MEIOSIS
Page
9
Words matched
29 of 29

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

How this line gives the answer

5714, emb=0.8276, combined=0.7252). Verified: high — The span explicitly states that crossing over occurs during the first meiotic division, which conclusively identifies Prophase I of meiosis as the correct stage.

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