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Get Answers to all your Questions
3. Describe the events taking place during interphase.
Answers (1)
Interphase refers to the phase in the cell cycle which prepares the cell and its nucleus for the division. Interphase is divided into three sub-phases like G1,S and G2 phases.
1. G1 phase- It is the longest stage of interphase, also called the first growth phase or post-mitotic gap phase. Both the cell and its nucleus grow in size. There is the synthesis of RNA, proteins, nucleotides, amino acids for histones and energy-rich compounds. There is a checkpoint called G1 cyclin or CG1, where the decision about the entry in the G0 stage is taken. If the decision is made cell cycle goes on uninterrupted or the cell undergoes the G0 stage. It refers to the resting phase in which the cell is arrested and not allowed to divide.
2. S Phase- In this phase, chromosomes along with their DNA replicates. The content of DNA doubles up, however, the number of chromosomes remains the same in other words ploidy remains same. After replication, the daughter chromosomes remain attached in the region of the centromere. The centrosome, if present begins to divide.
3. G2 phase- This phase is characterised by increased synthesis of RNA and proteins. The cell organelles undergo multiplication in this phase while the cell grows in size. G2 phase is also called as second growth phase or pre-mitotic gap phase.
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