G1 Phase

• also called First Gap.
• It is called the first gap because, little change is visible.
• the cell is just growing at this stage, no DNA replication or anything.
• The cell is accumulating the building blocks of chromosomal DNA and the associated proteins.
• The cell is also trying to build up sufficient energy to complete the task of replicating each chromosome in the nucleus.
• Cell increase in size and volume.

The cell is producing the following during this stage to prepare for S and M phase:

• Carbohydrates
• Lipids
• Proteins
• Enzymes

"Ensure ordered progression through the cell cycle." (_Panagopoulos_ & Altmevyer, 2021)

• also known as restriction point in yeast.
• This is the G1 Phase and S Phase checkpoint.
• Cell commits to divide if nutrients and cell size is sufficient.
• Damages in DNA are also checked.