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    Cell Cycle and Cell Division
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    Name the sub-stage of meiosis in which crossing over takes place.
    Pachytene.
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    • Name an important event that occurs during meiosis and not during mitosis.
    Crossing over takes place during meiosis but not during mitosis.
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     Namethe five phases of of Prophase I.
    The five phases of prophase 1 are
    i. Leptotene
    ii. Zygotene
    iii. Pachytene
    iv. Diplotene
    v.  Diakinesis. 
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    What is polyteny ?
    Polytene chromosomes are giant chromosomes which are formed due to repeated DNA replication without cell division. They are found in some insects. 
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    Name the process in which there is an exchange of genetic material between non-sister chromatids of homologous chromsomes during meiosis.
    Crossing over.
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     What are two types of cells on the basis of presence or absence of nucleus ?
    On the basis of the presence and absence of nucleus the cells are divided into two types Eukaryotic and prokaryotic cells.
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