This presentation is all about the major events in G1, S, G2 and mitosis phase of cell cycle.

1. Introduction to Cell Cycle
By Prekshi Garg

2. Cell Cycle
It refers to the series of events that take place in a
cell leading to the growth, duplication and
division of cell to produce two daughter cells.
Cell cycle comprises of two stages
• Karyokinesis – Division of nucleus
• Cytokinesis – Division of cytoplasm

3. Interphase
• G1 phase
• S phase
• G2 phase
M phase
• Either mitosis
or meiosis
G0 phase
KARYOKINESIS

4. Stages Of Cell Cycle
• Also known as Gap phase
1
• Cell organelles duplicate
• Proteins and enzymes
involved in DNA synthesis
are produced in large
amount.
• Cell size increases.
• Also known as Synthesis phase.
• DNA is synthesized to form two copies of
the genome.
• Phase completes when each
chromosome has two sister chromatids.
• Also known as
Gap phase 2
• Cell continues to grow
in size.

5. Mitosis
Prophase
Metaphase
Anaphase
Telophase
Mitosis is the type of cell division
that forms two daughter cells that
have same number of
chromosomes as the parent
nucleus.

6. Prophase
• Nucleus enlarges and occupies most of the cell
volume.
• Long thread like structures appear inside the cell.
• Nuclear membrane and nucleolus disappears.
• Centrioles move towards opposite poles.

7. Metaphase
• The chromosomes become shorter and thicker,
hence they are deeply stained.
• The chromosomes get attached to the
spindle fiber.
• The chromosomes get arranged at the equator
such that the centromere is arranged at the
center and the chromatids face towards the
poles.

8. Anaphase
• The centromere of the chromosomes split and
the two sister chromatids separate and move
towards opposite poles.
• The chromatids are in the shape of J, V and U.

9. Telophase
• The chromosomes lose their characteristic
shape and re-condense to form a mass
like network.
• The nuclear membrane
reappears dividing the nucleus into two
daughter nuclei.
• Spindle fibre disappears.
• Cell plate or furrow formation takes place.

10. Thank You..!!