NEET BIOLOGY

Detailed explanation-1: -If cells don’t pass the G1 checkpoint, they may “loop out” of the cell cycle and into a resting state called G0, from which they may subsequently re-enter G1 under the appropriate conditions. At the G1 checkpoint, cells decide whether or not to proceed with division based on factors such as: Cell size. Nutrients.

Detailed explanation-2: -Cell cycle checkpoints To ensure that each phase of the cell cycle is carried out correctly, essential steps are followed by a checkpoint. It is a control mechanism where certain conditions must be met before the cell can progress to the next step.

Detailed explanation-3: -Cell cycle checkpoints are surveillance mechanisms that monitor the order, integrity, and fidelity of the major events of the cell cycle. These include growth to the appropriate cell size, the replication and integrity of the chromosomes, and their accurate segregation at mitosis.

Detailed explanation-4: -The G1 checkpoint is where eukaryotes typically arrest the cell cycle if environmental conditions make cell division impossible or if the cell passes into G0 for an extended period. In animal cells, the G1 phase checkpoint is called the restriction point, and in yeast cells it is called the start point.

Detailed explanation-5: -The cell cycle has checkpoints (also called restriction points), which allow certain genes to check for problems and halt the cycle for repairs if something goes wrong. If a cell has an error in its DNA that cannot be repaired, it may undergo self-destruction (apoptosis ).