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Cell Cycle and Cell Division

Short Answer Type

31. What is chiasmata ? State its significance.

Chiasmata is the X-shaped structure formed due to the point of contact between paired chromatids during meiosis. It is the point representing the crossover where the homologous chromosomes are joined to each other.

Significance.- At chiasmata crossing over occurs in pachytene stage. The crossing over brings variations which are raw material of evolution.

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32. Why is meiosis essential in sexually reproducing organisms ?

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

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34. Distinguish between Metaphase I and Metaphase of mitosis.

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Long Answer Type

35. Draw diagram of mitosis.

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36. Draw the diagram of meiosis.

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Short Answer Type

37. What is the average cell cycle span for a mammalian cell ?

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38. Can there be mitosis without DNA replication in ‘S’ phase ?

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39. Can there be DNA replication without cell division.

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40. Distinguish between cytokinesis and karyokinesis.

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