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Define the following: Synapsis...

Define the following:
Synapsis

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(i) -Synapsis: A process of pairing of homologous chromosomes. It starts during zygotene of prophasel.
(ii) Bivalent: It refers to pair of homologous chromosome formed by synapsis. The number of bivalents is half to the number of chromosomes in a diploid organism.
(iii) Chiasmata: Points of crossing over between the non-sister chromatids of homologous chromosomes. These are formed during pachytene of pro-, phase I of meiosis. These are sites of crossing over.
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ICSE-CELL CYCLE AND CELL DIVISION -REVIEW QUESTIONS (DIFFERENTIATE BETWEEN THE FOLLOWING)
  1. Mitotic prophase and Meiotic prophase I

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  2. Name the stage of cell cycle at which one of the following events occu...

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  3. Define the following: Synapsis

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  4. How does cytokinesis in plant cells differ from that in animals cells ...

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  5. What is the significance of meiosis?'

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  6. Can there be mitosis without DNA replication in 'S' phase?

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  7. Where does the cell plate formation take place in mitosis in a plant c...

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  8. If a diploid cell has'24 chromosomes, how many chromosomes will be pre...

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  9. Name the chromosome that has centromere in the middle.

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  10. Differentiate between the following : Animal cell and Plant cell.

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  11. Describe the stage of mitosis when centromere splits into two.

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  12. Draw the stage of meiosis when synapsis takes place.

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  13. How mitosis differs in animal and plant cells?

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  14. Name a few conditions when cells undergo mitosis.

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  15. Given below is a diagram representing a stage during mitotic cell divi...

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  16. What will happen if there is no reduction of chromosomes in meiosis?

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  17. What is the importance of crossing over?

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  18. What is the difference in the chromosome number of daughter cells prod...

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  19. How do variations arise in sexually reproducing organisims? Explain br...

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  20. What is the importance of mitosis?

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