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Cell Growth

Mrs. Harlin

1.2.2

Analyze how cells grow and reproduce in terms of interphase, mitosis and cytokinesis.

1.1. Interphase (cell appears normal)Interphase (cell appears normal)G0- cell is carrying out normal activityG0- cell is carrying out normal activity

Growth 1 (G1 phase)- growth of cellGrowth 1 (G1 phase)- growth of cell Synthesis (S phase)- DNA is copiedSynthesis (S phase)- DNA is copied Growth 2 (G2 phase)- more growthGrowth 2 (G2 phase)- more growth2. Mitosis-cell division2. Mitosis-cell division ProphaseProphase MetaphaseMetaphase AnaphaseAnaphase TelophaseTelophase3. Cytokinesis- cytoplasm divides; 3. Cytokinesis- cytoplasm divides; division completedivision complete

Asexual Reproduction

Mitosis is considered asexual reproduction because it produces IDENTICAL copies of a cell for growth and repair.

There is genetic stability- no variation!

2 daughter cells identical to original

Parent cell

Chromosomes are copied and double in number

Chromosomes now split

Cell grows and Cell grows and carries on carries on metabolism; metabolism; chromatin is chromatin is replicated and replicated and condensed so condensed so sister chromatids sister chromatids are joined at the are joined at the centromere.centromere.

It is the longest It is the longest phase.phase.

Nuclear envelope disappears

Spindle fibers form which are attached to 2 centrioles (only found in animal cells).

Chromatin coils to form visible chromosomes.

Chromosomes attach to spindle.

Chromosomes Chromosomes are lined up at are lined up at the equator the equator (middle) of the (middle) of the spindle.spindle.

Centrioles are at Centrioles are at opposite ends of opposite ends of the cell.the cell.

Centromeres Centromeres split and sister split and sister chromatids are chromatids are pulled apart to pulled apart to opposite poles opposite poles of the cell.of the cell.

Nuclear Nuclear envelope envelope reforms around reforms around chromosomes chromosomes at each pole.at each pole.

The splitting of The splitting of the cytoplasm to the cytoplasm to form 2 distinct form 2 distinct cells.cells.

Cells->Tissues->Organs->Organ Cells->Tissues->Organs->Organ Systems-> OrganismsSystems-> Organisms