Cell DivisionMitosis

Reasons for MitosisThere are three main reasons

a.Growth b.Repair/Healingc. Asexual Reproduction

Cell DivisionOther cells divide rarely or never

Brain Cell – Nerve cell

Spinal Cord Cell- Nerve cell

Cardiac Cell (Heart Muscle)

Cell Division2 kinds of cell division:

1. Mitosis: division of somatic cells

(all body cell except sex cells – gametes)

1. Meiosis: creation of gametes

Sperm cells Human egg cell

Cell Division Vocabulary

diploid (2n) – a cell with 2 chromosome sets in each of its cells; all body (somatic) cells

haploid (n) – a cell with 1 chromosome set in each of its cells; all gametes (sperm, eggs)

MitosisMitosis produces two

genetically identical cells

Mitosis is referred to in the following stages:

1.Prophase

2.Metaphase

3.Anaphase

4.Telophase

InterphaseTechnically not part of MitosisCells are growingLong strings of DNA are messy and coiled

ProphaseIn nucleus:The chromosomes replicates, condense, visible and remain next to each otherIn cytoplasm:The spindle forms

chromatin

duplicatedchromosome

Draw Prophase

Prophase

Sister chromatidsCentromere

Centriole

Spindle fibers

Metaphase (meet in the middle)

Nucleus membranes breaks apart

Chromosomes line up at the equator of the cell

Spindle fiber interacts with the chromosomes by attaching to the centromeres

Centrioles migrate to opposite poles of the cell

Centriole

Spindle fibers

Draw Metaphase

Anaphase (apart)Chromosomes are separate into 2 genetically identical groups

(The spindle fibers pulls the chromosomes to opposite poles)

moved to the opposite ends of the spindle

Anaphase The spindle fibers

contract and the chromosomes are pulled to opposite poles

Draw Anaphase

TelophaseIn Telophase the nucleus actually

divides!

The chromosomes are at the poles of the cell

The nuclei membranes reforms around each sets of chromosomes(pinching the balloon in the middle)

Draw Telophase

Cytokinesis – dividing cytoplasm

In animal cells, a Cleavage Furrow forms and separates Daughter Cells

In plant cells, a Cell Plate forms and separates Daughter cells.

Cleavage furrow in a dividing frog cell

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

1

2

3

4

5

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

Prophase

2

3

4

5

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

Prophase

Metaphase

3

4

5

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

Prophase

Metaphase

Anaphase

4

5

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

Prophase

Metaphase

Anaphase

Telophase

5

Mitosis: Can you name the stages?Mitosis: Can you name the stages?

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Phases of cell cycle- IPMATCPhases of cell cycle- IPMATC

Interphase

Cytokinesis

Phases of cell cycle- IPMATCPhases of cell cycle- IPMATCImportant

People

Must

Analyze

Tasks

Correctly

Impatient

People

May

Attack

Teachers

Constantly