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Cell Cycle and Cell Division

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Can there be mitosis without DNA replication in ‘S’ phase ?

No, mitosis cannot occur without DNA replication in S phase. For the formation of new cells additional DNA is required and it is very necessary to maintain the chromosomal number in the dayughter cells. thus, mitosis cannot occue without the duplication of DNA in the S phase



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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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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 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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 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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