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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
List the main differences between meiosis and mitosis.

Mitosis Meiosis
1.  Equational division. Chromosome number remains the same in the daughter cells.  

1. Reduction division. Chromosome number is resuced to half in the daughter cell.

2. Occurs in somatic cells

2. Occurs in germ cells. 

3. Occurs in both sexually and asexually reproducing organisms.

3. Occurs only in sexually reproducing organisms.
 
4. No crossing over takes place.

4. Crossing over takes place during pachytene stage.

5. Prohase is simple and not divided into sub stages. 5. Prohase I of meiosis I is complex and has 5 stages.

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

Crossing over.

 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 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.

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. 

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

Crossing over takes place during meiosis but not during mitosis.