What is Mitosis Mitosis Cell division involving somatic

What is Mitosis? • Mitosis: Cell division involving somatic (nonsex) 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 – G 1, S, G 2 • • 2) Prophase 3) Metaphase 4) Anaphase 5) Telophase mitosis

Interphase • Divided into 3 Stages: • G 1 Stage – Normal function performed – Cell growth – Organelles created • S Stage – Chromatin (DNA strands) duplicated • G 2 Stage – Cell growth – Normal function performed

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

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

Anaphase • 3 rd stage of mitosis • Spindle fibers pull ½ the chromatids to each end of the cell

Telophase • 4 th stage of mitosis • Spindle fibers dissolve • Chromatids unwind into chromatin • Nucleus reforms • Cytokinesis occurs

Cytokinesis • Defined: Dividing of the cytoplasm • In animals: Cell pinches inward • In plants: Cell plate begins to separate the two new cells

Name that Stage! Hint: Chromosomes are aligned in middle of cell

Name that Stage! Hint: Cell plate is splitting the cell

Name that Stage! Hint: Two normal looking nuclei of two cells

Name that Stage! Hint: Chromosomes are forming and the nucleus is gone

Name that Stage! Hint: Chromatids are being pulled apart

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Mitosis A Quick Overview

Recap 1) In order, name the 5 stages of the cell cycle. 2) Pick a stage of the cell cycle. Name two things that happen in this stage. 3) Review the picture slides. Identify the stages based on the picture. 4) The division of the cytoplasm is called _____. 5) Which cells divide by mitosis? 6) During which interphase stage is DNA created? 7) During which stage do spindle fibers form? 8) During which stage are chromosomes aligned in the middle? 9) During which stage are chromatids separated? 10) During which stage does the nucleus dissolve?