1 G1 phase In this phase cell is metabolicaaly active but don't undergo DNA replication.
2 G0 phase Some cells leave cell cycle and enter into quiescent stage of cell cycle.Cells in this stage remain metabolicaaly active but no longer proliferate until required.
3 This represents first check point governed by RB Gene which is key negative regulator of cell cycle proliferation..It is also regulated by CDK/Cyclins.
4 After passing this checkpoint cell starts preparing for S(synthesis phase)
5 Synthesis phase,It represent second check point G2/M phase.In this synthesis phase amount of DNA per cell doubles.This is a important check point as cells don't undergo mitosis till the damage is complete recoverd.Governed by PLK1 Gene.
6 G2 phase In this stage proteins are synthesized for mitosis while cell growth continues.
7 It represents transition to M phase as the cells don't cross this check point,till damage is repaired.
8,9 It represent stages of mitosis Marked by prophae metaphase anaphase and ended by telophase where daughter cells are separated into two.It is the longest phase of cell cycle.
10 It is marked by cytokinesis,in which synthesis of cytoplasm takes place.
Answers & Comments
Answer:
1 G1 phase In this phase cell is metabolicaaly active but don't undergo DNA replication.
2 G0 phase Some cells leave cell cycle and enter into quiescent stage of cell cycle.Cells in this stage remain metabolicaaly active but no longer proliferate until required.
3 This represents first check point governed by RB Gene which is key negative regulator of cell cycle proliferation..It is also regulated by CDK/Cyclins.
4 After passing this checkpoint cell starts preparing for S(synthesis phase)
5 Synthesis phase,It represent second check point G2/M phase.In this synthesis phase amount of DNA per cell doubles.This is a important check point as cells don't undergo mitosis till the damage is complete recoverd.Governed by PLK1 Gene.
6 G2 phase In this stage proteins are synthesized for mitosis while cell growth continues.
7 It represents transition to M phase as the cells don't cross this check point,till damage is repaired.
8,9 It represent stages of mitosis Marked by prophae metaphase anaphase and ended by telophase where daughter cells are separated into two.It is the longest phase of cell cycle.
10 It is marked by cytokinesis,in which synthesis of cytoplasm takes place.
Explanation: