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Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

  • Prophase-I during meiosis

  • Prophase-II during meiosis

  • Prophase of mitosis

  • Both prophase and metaphase of mitosis

Answer

A.

Prophase-I during meiosis

The figure shows zygotine stage of prophase-I of meiosis-I. During this stage, bivalent chromosomes clearly appear as tetrads, Pachytene stage is characterized by the appearance of recombination nodules, the sites at which crossing over (exchange of genetic material) occurs between non-sister chromatids of the homologous chromosomes.

The figure shows zygotine stage of prophase-I of meiosis-I. During this stage, bivalent chromosomes clearly appear as tetrads, Pachytene stage is characterized by the appearance of recombination nodules, the sites at which crossing over (exchange of genetic material) occurs between non-sister chromatids of the homologous chromosomes.