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Cell Cycle and Cell Division

Short Answer Type

21. What are motor proteins ?

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22. Why Meiosis II is necessary when cell is divided in Meiosis I ?

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Long Answer Type

23. Describe cell cycle.

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24. Describe significance of mitosis.

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25. What are mitotic poisons ?

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26. Describe Meiosis II or Homotypic division.

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27. Describe significance of meiosis.

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Short Answer Type

28. Why does a multi cellular organism require two types of cell division ?

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Long Answer Type

29. “A well known biologist stated that the life history of an organism can be summed up as gametic fusion, equational division and reductional division.” Comment.

The given statement is correct on the basis of the following facts :

1. The gametic fusion takes place at the time of fertilisation when sperm and ovum fuse to form a diploid zygote.

2. The zygote is divided by mitotic division during its embroynic life and post embryonic life to form a well developed individual.

3. A mature individual produces gametes by gametogensis. Reductional division takes place at this stage and results in the formation of haploid gametes.

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30. Why is meiosis called the reductional division and mitosis called equational division?

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