Mitosis

What is Mitosis? Mitosis: Cell division involving somatic (non-sex) cells Involves only diploid cells Form of asexual reproduction for some life (bacteria & protista, fungi) End Result: Two genetically identical “daughter cells”

The Cell Cycle Defined: Repeating set of events in the life of a cell 1) Interphase G1, S, G2 2) Prophase 3) Metaphase 4) Anaphase 5) Telophase

Interphase Divided into 3 Stages: G1 Stage S Stage G2 Stage Normal function performed Cell growth Organelles created S Stage Chromatin (DNA strands) duplicated G2 Stage

Prophase 1st Mitosis Stage Chromatin (DNA strands) coils into chromosomes Nucleus dissolves spilling the chromosomes Spindle fibers form

Metaphase 2nd stage of mitosis Spindle fibers attach to centromeres of each chromosome Spindle fibers pull the chromosomes to the cell’s equator

Anaphase 3rd stage of mitosis Spindle fibers pull ½ the chromatids to each end of the cell Humans: 46 chromatids each way

Telophase 4th stage of mitosis Spindle fibers dissolve Chromatids unwind into chromatin Nucleus reforms Cytokinesis: division of the cytoplasm

Cell plate

Real Mitosis video clip Animated Mitosis Clip Be patient. The video may take a moment to load. Real Mitosis video clip

Name that Stage! Metaphase

Name that Stage! Telophase

Name that Stage! Interphase

Name that Stage! Prophase

Name that Stage! Anaphase

Prophase Metaphase Interphase Telophase Anaphase

Quick Review Mitosis = the division of somatic (non-sex) cells Each stage has different characteristics End Result = Two identical diploid cells