Mitosis and Cell Division

New Cells About 2 trillion new cells each day. About 25 million per second!! Cell division is also called cell reproduction. -

New Cells The type of cell division depends on the type of cell. Prokaryotes divide differently than eukaryotes. -

Mitosis Cells getting ready to divide. Takes place continuously. Non-reproductive cells. Takes place continuously. Except nerve cells. -

Stages of Mitosis Interphase Most of the cell’s life cycle is spent in this phase. Cell increases in size just before the next phase begins. -

Stages of Mitosis Prophase Mitosis begins. All organelles divide so number doubles. All DNA coils up into chromosomes. Chromosomes copy themselves. -

Chromosomes

Chromatids centromere chromatid Sister chromatids

Prophase

Stages of Mitosis Metaphase Chromosomes line up, break apart. Each side contains all genetic information.-

Metaphase

Stages of Mitosis Anaphase Broken halves of chromosome pulled to opposite sides of the cell. -

Anaphase

Stages of Mitosis Telophase Nucleus re-forms. Mitosis is complete. Cell division almost done. -

Telophase

After Mitosis Cytokinesis: Cytoplasm divides and you have two distinct daughter cells. -

Cytokinesis

Interphase Inside nucleus Then, coils tightly into chromosomes. DNA is in long strands in the nucleus

Prophase Inside Cell nucleus

Replicated Chromosome centromere Replicated Chromosome Chromosome

Metaphase Inside Cell Cell Equator

Anaphase Spindle fibers Centriole

Telophase

Cytokinesis