Question

differentiate between G1, S and G2 phase ​

Answer 1

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G1 Phases:

1. It is the first sub stage of interphase.

2. Available factors determine its fate, entry in Go, differentiation or continuity of cell cycle.

3. Cell organelles do not increase in number.

4. Cell grows in size but growth of nucleus is little.

5. It synthesizes RNAs, proteins and other biochemical for cell growth and subsequent replication of DNA.

G2 Phases:

1. It is the last sub stage of interphase.

2. There is very little choice for the cell except to proceed further in cell cycle.

3. Cell organelles increase in number.

4. Both cell and nucleus grow in size.

5. It synthesizes RNAs, proteins and other biochemical for spindle formation and M- phase division.

Answer 2

Explanation:

G1(first gap phase or post mitotic gap phase)

*The cell is metabollically active and continuously grows.

*Synthesis of RNA and protein takes place.

S phase

*Replication or synthesis of DNA take place.

*The amount of DNA per cell doubles.If the initial amount of DNA is denoted as 2C then it increases to 4C.

*There is no increase in the number of chromosome, If the cell had diploid or 2n number of chromosome at G1, even after S phase the no. of chromosome remains the same ie., 2n

*Each chromosome is duplicated and has two sister chromatids held together by a common centromere.

G2 phase ( second gap phase or premitotic gap phase)

*cell growth continues

*RNA and protein synthesis continues