In meiosis crossing over is initiated at

(A)zygotene
(B)diplotene
(C)pachytene
(D)leptotene

The NCERT line that answers it

Verbatim line

This stage is characterised by the appearance of recombination nodules, the sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes.

Chapter: Cell Cycle and Cell Division
Section: 10.4.1 Meiosis I
Page: 6
Words matched: 57 of 57

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

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'This stage is characterised by the appearance of recombination nodules, the sites at which crossing over occurs', directly identifying pachytene as the stage where crossing over is initiated.

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Question text is reproduced from the published NEET 2016 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.