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Objectives

Objectives. Recognize the chromosomes of daughter cells, formed through the processes of asexual reproduction and mitosis, the formation of somatic (body) cells in multicellular organisms, are identical to the chromosome of the parent cell.

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Objectives

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  1. Objectives • Recognize the chromosomes of daughter cells, formed through the processes of asexual reproduction and mitosis, the formation of somatic (body) cells in multicellular organisms, are identical to the chromosome of the parent cell. • Recognize that during meiosis, the production of sex cells, chromosomes are reduced to half the number present in the parent cell. • Explain how fertilization restores the diploid number of chromosomes.

  2. duplicated chromosome chromatin Chromosomes • Chromosomes are made up of chromatin (which is made up of DNA). • Not visible until during cell division.

  3. The Cell Cycle - Introduction • The cell cycle occurs in five stages. • Interphase • Prophase • Metaphase • Anaphase • Telophase I Prefer Milk And Tea

  4. The Cell Cycle - Interphase • Interphase • The majority of the life of a cell is spent in interphase. • Cell growth • DNA replication • Preparation for mitosis

  5. Objectives • Recognize the chromosomes of daughter cells, formed through the processes of asexual reproduction and mitosis, the formation of somatic (body) cells in multicellular organisms, are identical to the chromosome of the parent cell. • Recognize that during meiosis, the production of sex cells, chromosomes are reduced to half the number present in the parent cell. • Explain how fertilization restores the diploid number of chromosomes.

  6. prophase Mitosis - Prophase • What happens: • Chromosomes become visible. • Spindles begin to form. • Nucleus breaks down.

  7. prophase metaphase Mitosis - Metaphase • What happens: • Chromosomes line up across cell. • Spindles attach to chromosomes.

  8. Mitosis - Anaphase • What happens: • Chromosomes begin to split and move to opposite ends of cell.

  9. Mitosis - Telophase • What happens: • Chromosomes begin to dissipate back into chromatin. • Nucleus reforms. • Spindles break apart.

  10. Cytokinesis • The cytoplasm divides . • Usually occurs the same time as telophase.

  11. Homework • Chapter 10 and 11 Reviews: • Pg. 249 1-6 • Pg. 278 1-4

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