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Why is meiosis essential in sexually rep...

Why is meiosis essential in sexually reproducing organisms ?

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Meiosis reduces the chromosomes to half as it is followed by fertilization which restores diploidy. If in this gametes are formed by mitosis and not by meiosis, then the gametes will be diploid which will result tetraploidy after their fusion during fertilization II
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Pick out the correct statements. (a)Mitosis takes place in the somatic cells and the meiosis takes place in the germ cells. (b)During mitosis, the DNA replicates once for one cell division and in meiosis, the DNA replicates twice for two cell division. (c)mitosis and meiosis occur both in sexually and asexually reproducing organisms

Pick out the correct statements (A) Mitosis takes place in the somatic cells and meiosis takes place in the germ cells (B) During mitosis, the DNA replicates once for one cell division and in meiosis the DNA replicates twice for two cell divison (C) Mitosis and meiosis occur both in sexually and asexually reproducing organisms

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MODERN PUBLICATION-CELL CYCLE AND CELL DIVISION-REVISION EXERCISE ( SHORT ANSWER QUESTION)
  1. Define meiosis. Give the occurrence of meiosis.

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  2. Distinguish between metaphase of mitosis and metaphase-I of meiosis.

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  3. Why is meiosis essential in sexually reproducing organisms ?

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  4. Name the forces which help in chromosomal movement during cell divisio...

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  5. What is interphase? Why was it previously known as resting phase?

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  6. What is G.-phase? What changes occur in it?

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  7. Give the structure of spindle apparatus.

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  8. Distinguish between plant and animal cell mitosis.

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  9. What is disjunction? Describe the stage when it occurs.

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  10. Why is meiosis called the reductional division,whereas mitosis is call...

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  11. What is synaptonemal complex? Give its significance.

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  12. Differentiate between gametic meiosis and zygotic mciosis.

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  13. Define the term synapsis. Name the stage of cell cycle when it occurs.

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  14. Define the term crossing-over. Name the stage of cell cycle when it oc...

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  15. Define the term chiasmata. Name the stage of Prophase-I when it occurs...

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  16. How does cell division of a typical plant cell differ from that of a t...

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  17. What is the significance of meiosis?

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  18. What are homologous chromosomes? What happens to homologues during mei...

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  19. Anaphase-I of meiosis differs from anaphase of mitosis in one essentia...

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  20. Why does a Multicellular organism require two type of cell division?W...

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