Define about phases G1, G2 ,G0 …
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Posted by Parisha Dahiya 4 years ago
- 2 answers
Yogita Ingle 4 years ago
- G1 phase (Gap 1) – G1 phase is the phase of the cell between mitosis and initiation of replication of the genetic material of the cell. During this phase, the cell is metabolically active and continues to grow without replicating its DNA.
- S phase (Synthesis) – DNA replication takes place during this phase. If the initial quantity of DNA in the cell is denoted as <i>2N</i>, then after replication it becomes <i>4N</i>. However the number of chromosomes does not vary, viz., if the number of chromosomes during G1 phase was <i>2n</i>, it will remain <i>2n</i> at the end of S phase. The centriole also divides into two centriole pairs in the cells which contain centriole.
- G2 phase (Gap 2) –During this phase, the RNA, proteins, other macromolecules required for multiplication of cell organelles, spindle formation, and cell growth are produced as the cell prepares to go into the mitotic phase.
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M phase
This is the mitotic phase or the phase of the equational division as the cell undergoes a complete reorganization to give birth to a progeny that has the same number of chromosomes as the parent cell. The other organelles are also divided equally by the process of cytokinesis which is preceded by mitotic nuclear division. The mitotic phase is divided into four overlapping stages:-
- Prophase,
- Metaphase,
- Anaphase, and
- Telophase
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Parisha Dahiya 4 years ago
0Thank You