G Phases and S Phases Mitosis

ALL YOU NEED TO KNOW ABOUT MITOSIS

This is the sequence of growth and division of a cell. It is broken into 3 parts: Interphase, nuclear division(mitosis) and cytokinesis.

​

​CELL CYCLE

This is a phase in the cell cycle when the cell prepares for division. It has three steps: G1, S and G2

​

INTERPHASE

THE 3 STEPS OF INTERPHASE

In the G1 phase, the cell grows and carries out it's normal function. In the S or synthesis phase, chromosomes are replicated. In the G2 phase, the cell continues to grow and prepares for cell division

PROPHASE

Mitosis is the division of the nucleus while cytokinesis is the division of the cytoplasm. Cell division happens during mitosis. There are 4 steps of mitosis: prophase, metaphase, anaphase and telophase.

​

​MITOSIS AND CYTOKINESIS

​PROPHASE

1. Chromosomes form (DNA condenses)

2. Nuclear envelope breaks down

3. Special micro tubules called spindle fibers form from the centrioles

​METAPHASE

1. Chromosomes line up down the middle (equator)

2. Spindle fibers attach to the center of the chromosomes (centromeres)

Chromosomes are pulled to the opposite ends of the cell by the spindle fibers (Sister chromatids are separated)

​

​ANAPHASE

TELOPHASE

1. 2 new cells begin to form

2. Nucleus reappears around both sets of DNA

CYTOKINESIS

​In Plants: A cell plate is developed during telophase and forms the new cell wall so cell can divide
In Animals: Cell membrane forms a cleavage furrow to pinch off to form 2 identical cells

DIAGRAMS

​DNA STRUCTURE

​CHROMOSOME STRUCTURE

DIAGRAMS

DIAGRAMS

​NUCLEAR ENVELOPE

DIAGRAMS