Describe Meiosis II or Homotypic division. from Biology Cell Cycl

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 Multiple Choice QuestionsShort 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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 Multiple Choice QuestionsLong 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.


Meiosis II is very similar to mitosis. It has the following stages which are -:

1. Prophase II. It occurs immediately after cytokinesis of meiosis I. The nuclear membrane disaapars and chromosomes become compact.

2. Metaphase II. The chromosomes arrange themselves on the equator. Each chromosome is attached to the spindle fibres of opposite poles by its centromeres. The spindle microtubules from the opposite poles attach to the kinetochores of sister chromatids.

3. Anaphase II. The centromere of each chromosome divides into two sister chromatids. Thus two chromatids of each chromosome move towards opposite poles. 

4. Telophase II. The group of young chromosomes at each pole arranges itself into a daughter nucleus. The nuclear membrane is formed. Nucleoli appear and spindles disappear. takes place resulting in the formation of four daughter cells. 

 

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27. Describe significance of meiosis.
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 Multiple Choice QuestionsShort Answer Type

28. Why does a multi cellular organism require two types of cell division ?
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 Multiple Choice QuestionsLong 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.
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30. Why is meiosis called the reductional division and mitosis called equational division?
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