What are the 3 phases of interphase?

Answer 1

The three stages are

G1 phase - the cell is functionally normally and begins to grow in size. The nuclear envelope begins to break down.

S (Synthesis) phase - the cells DNA replicates

G2 phase - The mitotic spindle, made from cytokinetic fibres, begins to form. The cell ensures that the correct number of chromosomes and organelles are present. If so, Interphase ends and cell division continues.

Answer 2

It is divided into g1, which stands for growth 1/ the first growth period (this is spent growing and replicating organelles), s, which stands for synthesis (this is when the DNA is replicated), and g2, which stands for growth 2/ the second growth period (this is when the cell grows in preparation for division).

Answer 3

InterphaseBefore a cell can enter cell division, it needs to prepare itself by replicating its genetic information and all of the organelles. All of the preparations are done during the interphase. Interphase proceeds in three stages, G1, S, and G2. Cell division operates in a cycle. Therefore, interphase is preceded by the previous cycle of mitosis and cytokenesis.

[Diagram showing the cell cycle. The size of the arrows show the relative length of each stage of the cell cycle. Notice mitosis (M) is quite short.]

G1 Phase

After mitosis is complete the new daughter cell begins to accelerate its biochemical processes which were slowed down by mitosis. The length of the G1 phase creates the difference between fast dividing cells and slowly dividing cells. The G1 phase can be slowed by reducing the nutrients available in a system - thus the cell will take longer to build up the resources necessary for cell division. If there is a severe depletion in nutrients the cells can virtually stop growing. It is interesting to note that cells that aren't growing are always stopped in the G1 phase, being mitotically arrested. This suggests that once the cell enters the S phase, it is committed to cell division, regardless of the external cell conditions.

[Animal cell interphase. The DNA has been replicated. Also, notice the increased cell size as the cytoplasm has been enlarged.]

S Phase

The S phase begins with the replication of the cellular DNA. This is described in further detail in DNA replication. When the cellular DNA has been duplicated, leaving the cell with twice as many chromosomes (each chromosome is made up of two identical chromatids), the cell moves onto the G2 phase.

G2 Phase

During this phase proteins, such as kinase (which catalyzes protein phosphorylation), which are necessary for cell division are synthesized at this time. The chromosome begins to condense and the proteins necessary for construction of the mitotic spindle also are synthesized. When the chromosomes become visible the cell enters the first stage of mitosis, prophase.

Continue on to Mitosis 1: Prophase

Answer 4

The three stages are

G1 phase - the cell is functionally normally and begins to grow in size. The nuclear envelope begins to break down.

S (Synthesis) phase - the cells DNA replicates

G2 phase - The mitotic spindle, made from cytokinetic fibres, begins to form. The cell ensures that the correct number of chromosomes and organelles are present. If so, Interphase ends and cell division continues.

Answer 5

The three phases of Interphase is divided into the G1 phase, S phase, and G2 phase

Answer 6

1. gap 1
2. gap 2
3. synthesis

Answer 7

G1 phase G2 phase S phase

Answer 8

G1

s

g2

Answer 9

G1, s , g2