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The prophase I stage of meiosis …

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The prophase I stage of meiosis plays a vital role in r-DNA formation.justify with reason.

    • Posted by Hija Godak 6 years, 3 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 8 months ago

    • Meiosis a reduction cell division which takes places in the reproductive cells (Sperms , eggs).
    • In this division, the diploid number of chromosomes is reduced to haploid number of chromosomes.
    • At the end of meiosis, four haploid daughter cells are formed.
    • It is essential for sexual reproduction in all eukaryotes.
    • It occurs in two stages including meiosis I and meiosis II.
    • Meiosis I include Prophase I, Metaphase I, Anaphase I, Telophase I , Cytokinesis I.
    • Meiosis II include Prophase II, Metaphase II, Anaphase II, Telophase II , Cytokinesis II.
    • In Prophase I, there are 5 stages including Leptotene, zygotene, pachytene, diplotene, and diakinesis.
    • In Pachytene stage, crossing over takes place between non-sister chromatids of two homologous chromosomes which results in genetic variation.

     

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