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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
How does cytokinesis in plant cells differ from that in animal cells?

Cytokinesis in animal cell

Cytokinesis in plant cell

1. It occurs by furrow method.

2. The constriction in plasmalemma is formed by contraction of microfilaments.

3.Cleavage starts at the periphery and then moves inward, dividing the cell into two parts.

1. It occurs by cell plate method.

2. No constriction is formed.

3. Cell plate formation starts at the centre of the cell and grows outward, toward the lateral walls.

 

 

 Namethe five phases of of Prophase I.

The five phases of prophase 1 are
i. Leptotene
ii. Zygotene
iii. Pachytene
iv. Diplotene
v.  Diakinesis. 

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. 

 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.

Name the process in which there is an exchange of genetic material between non-sister chromatids of homologous chromsomes during meiosis.

Crossing over.

Name an important event that occurs during meiosis and not during mitosis.

Crossing over takes place during meiosis but not during mitosis.