The Cell Cycle and Mitosis

Chromosomes

oMade of DNAoEach chromosome consists of two sister chromatids attached at a centromere

Chromosome

Cell Cycle

oDuring the cell cycle, a cell grows, prepares for division, and divides to form 2 daughter cells, each with each of which then begins the cycle again.

oOrder of cell cycle is: Interphase Prophase Metaphase Anaphase Telophase Cytokensis (IPMATC)

InterphaseInterphase – growth and regular cell activity.oMost of cell life is spent in Interphase.olongest period of the complete cell cycle oDNA replicates

MitosisoDivision of somatic cells.o4 phases.oRemember Interphase is NOT part of Mitosis.

Prophase

oFirst stage of Mitosis

oChromatin condenses into chromosomes

oCentrioles separate and spindle fiber begins to form.

oNuclear membrane breaks down

Prophase

Metaphase

oSecond Phase of MitosisoChromosomes line up in middle of cell. (meet in middle)

oEach chromosome connects to spindle fiber at centromere.

Metaphase

Anaphase

oThird Phase of Mitosis

oSister chromatids pull apart or away

o individual chromosomes move to opposite ends of the cell.

Anaphase

Telophase

oFourth and Final Stage of Mitosis

oChromosomes gather at opposite ends of cell, lose distinct shapes

oTwo new nuclear membranes form.

Telophase

Cytokinesis

oNOT part of Mitosis

oDivision of cytoplasm after mitosis

oContractile ring tightens creating "cleavage furrow"

oEach daughter cell has an identical set of duplicate chromosomes

Cytokinesis

Cell Cycle

oReview processoSynchronized Swimming Mitosis

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