5.2 Mitosis and Cytokinesis

Cells divide during mitosis and cytokinesis.

5.2 Mitosis and Cytokinesis

Chromosomes condense at the start of mitosis.

• DNA wraps around proteins (histones) that condense it.

DNA doublehelix

DNA andhistones

Chromatin SupercoiledDNA

5.2 Mitosis and Cytokinesis

• Chromatin- DNA plus proteins.

• Chromatid- One half of a duplicated chromosome.

• Centromere- Hold together Sister chromatids.

• Telomeres- protect DNA and do not include genes.

Condensed, duplicated chromosome

chromatid

telomere

centromere

telomere

5.2 Mitosis and Cytokinesis

Parent cell

centrioles

spindle fibers

centrosome

nucleus withDNA

Interphase• prepares the cell to

divide• DNA is duplicated.

Mitosis and Cytokinesis produce two genetically identical daughter cells.

5.2 Mitosis and Cytokinesis

Mitosis divides the cell’s nucleus in four phases.

PMATPROPHASE

METAPHASE ANAPHASE

TELOPHASE

5.2 Mitosis and Cytokinesis

Chromosomes condense, PAIR, and spindle fibers form.

Prophase

5.2 Mitosis and Cytokinesis

METAPHASE

Chromosomes line up in the MIDDLE of the cell.

5.2 Mitosis and Cytokinesis

ANAPHASE

Sister chromatids are pulled AWAY to opposite sides of the cell.

5.2 Mitosis and Cytokinesis

TELOPHASE

TWO new nuclei form and chromosomes begin to uncoil.

5.2 Mitosis and Cytokinesis

divides cytoplasm into two cells– In animal cells, the

membrane pinches closed.

– In plant cells, a cell plate forms.

5.2 Mitosis and Cytokinesis

Mitosis Overview

• Prophase- Chromosomes PAIR• Metaphase- Chromosomes line up in the MIDDLE• Anaphase- Sister chromatids are pulled AWAY• Telophase- TWO new nuclei are formed

PMAT

5.2 Mitosis and Cytokinesis

Prophase Metaphase

Anaphase Telophase Cytokinesis