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NEET2019BotanyCell Cycle and Cell DivisionActual

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- 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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