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NEET 2019
Exam
NEET
Year
2019
Subject
Botany
Chapter
Cell Cycle and Cell Division

NEET 2019 · Botany · Cell Cycle and Cell Division

Crossing over takes place between which chromatids and in which...

Crossing over takes place between which chromatids and in which stage of the cell cycle?

Options

  1. ANon-sister chromatids of non-homologous chromosomes at zygotene stage of prophase I
  2. BNon-sister chromatids of homologous chromosomes at pachytene stage of prophase I
  3. CNon-sister chromatids of homologous chromosomes at zygotene stage of prophase I
  4. DNon-sister chromatids of non-homologous chromosomes at pachytene stage of prophase I

Correct answer

B. Non-sister chromatids of homologous chromosomes at pachytene stage of prophase I

Step-by-step solution

Crossing over takes place between non-sister chromatids of homologous chromosomes at pachytene stage of prophase-I. This stage of prophase- \mathrm{I} in meiosis is characterised by the appearance of recombination nodules, the site at which crossing over occurs between non-sister chromatids of the homologous chromosomes.
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