Cell Cycle and Mitosis RHSA. Cell Cycle The life cycle of all cells has two main parts: 1. Interphase 2. Mitosis and cytokinesis.

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Presentation transcript:

Cell Cycle and Mitosis RHSA

Cell Cycle The life cycle of all cells has two main parts: 1. Interphase 2. Mitosis and cytokinesis

Interphase A cell spends most of its lifetime in interphase growing and replicating chromosomes. Interphase is divided into: 1. G1 phase 2. S phase 3. G2 phase

Interphase: G1 phase During the G1, or growth 1 phase of interphase, the cell makes new molecules and grows larger. This phase can be long or short depending on the type of cell and the health of an organism.

Interphase: S phase S is for synthesis of more DNA. During the S phase the uncoiled chromosomes, called chromatin, are replicated or duplicated. The nucleus of cells in interphase is a dark blob of chromatin.

Find onion cells in interphase!

Sister Chromatids Both copies of the chromosome are joined at the centromere. The identical copies are called sister chromatids.

Interphase: G2 phase During the G2 or growth 2 phase the cell again synthesizes more molecules and grows larger. Now the cell is big enough to divide into two new cells by mitosis.

Find cells undergoing Mitosis and Cytokinesis

Mitosis Only a very short part of a cell’s life is spent in mitosis. Mitosis is the elaborate process a cell has to ensure the precise division of all chromosomes. After mitosis, the cell divides all the cytoplasm and organelles in the process of cytokinesis.

Online resources Mitosis animation Mitosis videos mitosis.html mitosis.html Mitosis quizzes sis1.html sis1.html tosisisg/quiz.htmlhttp:// tosisisg/quiz.html sis_review.htmhttp://local.brookings.k12.sd.us/biology/ch10celldivision/mito sis_review.htm