Cell Division: Key Roles

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Presentation transcript:

Cell Division: Key Roles Genome: cell’s genetic information Somatic (body cells) cells Gametes (reproductive cells): sperm and egg cells Chromosomes: DNA molecules Diploid (2n): 2 sets of chromosomes Haploid (1n): 1 set of chromosomes Chromatin: DNA-protein complex Chromatids: replicated strands of a chromosome Centromere: narrowing “waist” of sister chromatids Mitosis: nuclear division Cytokinesis: cytoplasm division Meiosis: gamete cell division

The Cell Cycle Interphase (90% of cycle) • G1 phase~ growth • S phase~ synthesis of DNA • G2 phase~ preparation for cell division Mitotic phase • Mitosis~ nuclear division • Cytokinesis~ cytoplasm division

Mitosis Prophase Prometaphase Metaphase Anaphase Telophase

Prophase Chromosomes visible Nucleoli disappear Sister chromatids Mitotic spindle forms Centrosomes move

Prometaphase Nuclear membrane fragments Spindle interaction with chromosomes Kinetochore develops

Metaphase Centrosomes at opposite poles Centromeres are aligned Kinetochores of sister chromatids attached to microtubules (spindle)

Anaphase Paired centromeres separate; sister chromatids liberated Chromosomes move to opposite poles Each pole now has a complete set of chromosomes

Telophase Daughter nuclei form Nuclear envelopes arise Chromatin becomes less coiled Two new nuclei complete mitosis

Cytokinesis Cytoplasmic division Animals: cleavage furrow Plants: cell plate

Cell Cycle regulation Growth factors Density-dependent inhibition Anchorage dependence

Cancer Transformation Tumor: benign or malignant Metastasis

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