MitosisChapter 8

Cell Division

Binary Fission

• Another name for cell division in prokaryotes is binary fission.

• Cell splits in two.

Hemorrhagic E. Colisee the binary fission

Mitosis

• In Eukaryotic Cells the division of cells is called Mitosis.

• Formation of two identical daughter cells.

Mitosis: Overview

Interphase after S phase Mitosis, Cytokinesis

Homologous chromosomes: same size and shape

Duplicated homologous chromosome made of sister chromatids

Daughter cells have the sameDNA as the mother cell

Chromtids separate

Mitosis Overview

• Mitosis Animation

• Mitosis Movie

Prophase

• Chromatin fibers coil to become dense chromatids

• They join at the centromere

Prophase

• Nucleolus Disappears

• Spindle Fibers Form as microtubules out from the centromeres

• Nuclear envelope begins to disintegrate

Prophase

Centrioles now at opposite poles

Note spindles stretched pole to pole

Metaphase

Sister chromatids line up at the equator

Anaphase

• Spindle fibers pull the chromatids to the opposite poles

Telophase

• Chromatids are now at the opposite ends of the cell

Interphase

Mitosis: I

nuclear envelope

pair of centrioles

Early Prophase Late Prophase Prometaphase

Metaphase

Mitosis: IIAnaphase Telophase Interphase

Cell splits

Cytokinesis

Separation of cytoplasm

Animal Cytokinesis

Mitosis is over, and the spindle is now

disassembling.

Band of microfilaments at the former spindle equator contracts.

The contractions continue and cut the cell in two.

cell wall

former spindle equator

cell plate

vesicles converging

Plant Cytokinesis

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A: Interphase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A: anaphase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A:metaphase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A:prophase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. telophase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. prophase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. telophase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. anaphase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. metaphase

Which phase of mitosis?

Interphase

Prophase

Metaphase

Anaphase

Telophase

A. interphase

Practice Links

• Animal Cell Mitosis• Plant and Animal Cell

Mitosis• Nice Mitosis Animal C

ells

• Mitosis World (yes, it is as good as Disney World)