Interkinesis, Biology

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There is no Interphase preceding second meiotic division.

There is a brief intervening period called Interkinesis

During this period there may be synthesis of some reserve food and proteins. However, there is no replication of DNA prior to meiosis II.

Karyokinesis-ΙΙ

Karyokinesis of meiosis-II (Karyokinesis-II) can be distinguished into four stages namely
• prophase-II,
• metaphase-II,
• anaphase-II and
• Telophase-II.

Prophase-II:

  • It is of a short duration compared to prophase-I. No significant changes take place in the chromosomes.
  • Nuclear membrane and nucleolus disappear.
  • Asters and spindle fibers are formed.

Metaphase-II:

  • The chromosomes line up at the equator of the cell forming a single metaphase plate (as in mitosis).


Anaphase-II:

  • The centromere splits and two chromatids in each chromosome start moving away from each other. Finally, they reach the poles of the cell.
  • Each pole now has haploid number of chromosomes and half the amount of DNA.
  • Telophase-II:
  • Chromosomes at each pole uncoil and elongate to form chromatin.
  • Nucleolus and nuclear membrane are formed surrounding each chromatin network.
  • Asters and spindle fibers disappear and centrioles divide. Daughter nuclei are formed.

 


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