Question

Differentiate between G₁ phase and G₂ phase.

Answer 1

G₁ phase

G₁ is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during S phase.

G₂ phase

G₂ phase is a period of rapid cell growth and protein synthesis during which the cell prepares itself for mitosis.

Mitosis

1. It is a type of nuclear division that results in two daughter cells.
2. Each daughter cells contains same number of chromosomes of parent cell.
3. Mitosis occurs in somatic cells during growth, development or repair of an organism.
4. Mitosis is also known as somatic cell division.

G1 phase	G2 phase
G1 phase is the first growth phase or first gap.	G2 phase is the second growth phase or second gap.
First sub stage of interphase.	Last sub stage of interphase.
G1 phase proceeds to S phase.	G2 phase proceeds to mitotic phase.
During this phase, cell grows in size besides synthesising RNA and proteins.	During G2 phase synthesis of RNA and protein continues and two centrosomes are formed by replication of single centrosome.
No change in DNA content.	At the end of this phase, there is double the amount of DNA.