Cell DivisionCell Division& Mitosis& Mitosis

Cell division varies between Cell division varies between Prokaryotic and Eukaryotic Prokaryotic and Eukaryotic

CellsCells Prokaryotic cells are single celled Prokaryotic cells are single celled

organisms. Before the bacterium organisms. Before the bacterium can divide there must be two can divide there must be two copies of its DNA. This occurs by copies of its DNA. This occurs by the DNA molecule unzipping the DNA molecule unzipping itself into two different strands, itself into two different strands, which will form two separate which will form two separate interdependent strands. interdependent strands.

Once the DNA has replicated Once the DNA has replicated itself and the cell has grown to itself and the cell has grown to an appropriate size, the an appropriate size, the bacterium splits into two equal bacterium splits into two equal halves through a process called halves through a process called binary fission. binary fission.

Draw a picture of Binary Draw a picture of Binary Fission Fission

Asexual ReproductionAsexual Reproduction

Eukaryotic cells undergo Eukaryotic cells undergo nuclear division ( asexual nuclear division ( asexual reproduction). The life of a reproduction). The life of a eukaryotic cell is traditionally eukaryotic cell is traditionally diagrammed as a cell cycle. diagrammed as a cell cycle.

1.1. G1 Phase: rapid G1 Phase: rapid growth and metabolic growth and metabolic activity, protein activity, protein synthesis, cell spends synthesis, cell spends most time in this phase. most time in this phase.

S phase: DNA synthesis S phase: DNA synthesis and replication (copies), and replication (copies), chromosomes duplicate chromosomes duplicate and other cellular and other cellular organelles.organelles.

G2 Phase: centrioles G2 Phase: centrioles replicate; cell prepares replicate; cell prepares for divisionfor division

M phase: MITOSIS-M phase: MITOSIS-period of nuclear division period of nuclear division in which two daughter in which two daughter nuclei are formed, each nuclei are formed, each containing a complete containing a complete set of chromosomes. set of chromosomes.

C Phase: Cytokinesis-C Phase: Cytokinesis-process following mitosis process following mitosis or meiosis in which the or meiosis in which the cells cytoplasm divides cells cytoplasm divides and separates into new and separates into new cells. cells. Division of the Cytoplasm Division of the Cytoplasm

Cells Alive Cell Cycle