10.2 CellDivision Prokaryotes: just separate into two Eukaryotes: Two stages mitosis division of nucleus cytokinesis dividing cytoplasm in two Chromosomes:

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Presentation transcript:

10.2 CellDivision Prokaryotes: just separate into two Eukaryotes: Two stages mitosis division of nucleus cytokinesis dividing cytoplasm in two Chromosomes: Only visible during cell division At other times chromatin At cell division, chromosomes have been duplicated, and so are seen as two sister chromatids

Chromosomes Only visible during cell division At cell division, chromosomes have been duplicated and are seen as two sister chromatids joined at centromere

Chromosomes: DNA twisted together with proteins histones Then twisted again and again into chromatids

Cell Cycle Interphase: time between divisions cell growth duplication of genetic material Mitosis: nucleus and chromosomes divide Cytokinesis: cytoplasm divides

Cell Cycle

Interphase: time between divisions

Cell Cycle Prophase: Chromatin organizes into chromosomes. Nuclear membrane breaks up

Cell Cycle Metaphase: Chromosomes line up along cell equator

Cell Cycle Anaphase: Chromosomes separate toward opposite poles

Cell Cycle Telophase: Nuclear membrane reformes. Cytokinesis begins.

Cell Division: Mitosis

10.3 Regulating the Cell Cycle A. Controls on Cell Division Cells in a petri dish

10.3 Regulating the Cell Cycle A. Controls on Cell Division Cells in a petri dish

10.3 Regulating the Cell Cycle A. Controls on Cell Division Cells in a petri dish

10.3 Regulating the Cell Cycle A. Controls on Cell Division Cells in a petri dish

10.3 Regulating the Cell Cycle A. Controls on Cell Division Cells in a petri dish

10.3 Regulating the Cell Cycle B. Cell Cycle Regulators Cyclins Regulate timing of cell cycle 1.Internal Regulators cell won’t enter mitosis until chromosomes are replicated cell won’t enter anaphase until chromosomes are attached to the spindle

10.3 Regulating the Cell Cycle 2. External Regulators wound healing embryo development

10.3 Regulating the Cell Cycle C. Uncontrolled Cell Growth Cancer cells to not respond to usual regulatory signals, resulting in tumors. Gene p53 “Cancer is a disease of the cell cycle”

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