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Meiosis

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What is Meiosis?

Meiosis is a kind of cell division which produces four little girl cells. Every one of these cells comprises of a large portion of the quantity of chromosomes present in the parent cell, as in the creation of gametes and plant spores.

photo via wikipedia
Diplontic life cycle.

A. Meiosis I:

Here, the sets of homologous chromosomes are isolated and an exceptional cell division happens diminishing the cell from diploid to haploid.

Meiosis I is additionally partitioned into the accompanying stages,

  • Prophase I
  • Prometaphase I
  • Metaphase I
  • Anaphase I
  • TelophaseI
  1. Prophase I:

In Prophase I homologous chromosomes pair and trade DNA and recombinant chromosomes are framed.

Five Phases of Prophase I:

  • Leptotene
  • Zygotene
  • Pachytene
  • Diplotene
  • Diakinesis
photo via wikipedia
Haplontic life cycle
  • Prometaphase I:

In prometaphase I development of shaft device happens and chromosomes are connected to axle strands by kinetochores.

  • Metaphase I:

Here, the homologous sets of chromosomes are orchestrated in a twofold line along the metaphase plate. These chromosomes are arbitrarily organized along the metaphase plate.

  • Anaphase I:

In this stage partition of pair of homologous chromosomes happen and they move to the furthest edges of the cell.

  • Telophase I:

In the last phase of meiosis I, chromosomes become diffuse and reconstruction of atomic layer happens.

  • Cytokinesis:

Here, cells are at long last separated to shape two new cells, trailed by Meiosis II. The Haploid cells (recently shaped) comprise of one duplicate of every chromosome.

B. Meiosis II:

Two chromatids are shaped by isolating every chromosome in Meiosis II.

Note: Meiosis produces Genetic assorted variety.


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