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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At what stage can you observe lampbrush chromosomes ?

Diplotene stage  chromosomes become lampbrush like in oocytes of certain animals.
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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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 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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