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Chapter 10 All cells come from cells.

This chapter covers the different types of reproduction (asexual and sexual), the role of chromosomes in cell division, and the stages of the cell cycle. It also includes an explanation of mitosis and cytokinesis.

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Chapter 10 All cells come from cells.

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  1. Chapter 10All cells come from cells.

  2. Reproduction • Asexual reproduction-produces offspring that inherit all their genetic material from just one parent • Example: Sea Stars and Plants

  3. Reproduction continued…. • Sexual reproduction- two parents are involved in the production of offspring. • Examples: Egg and Sperm

  4. Reproduction continued… • Asexual and Sexual Reproduction-some unicellular and multicellular organisms • Examples: Slime molds and Sea Anemones • Can you think of some reasons why some organisms can do both?

  5. Repair and Growth • Take a moment to look at the skin on your arm. • Did you know that the outermost layer is actually dead cells? • New cells are gradually moving toward the surface, replacing dead cells that have rubbed off. • Asexual or Sexual reproduction? • The replacement of lost or damaged cells is just one of the important roles cells reproduction plays in your life. Another is growth-simply increasing in size from a baby to a child to an adult.

  6. The cell cycle multiplies cells. • Chromosomes and Cell Division • 1. Chromatin-a combination of DNA and protein molecules • 2. Chromosomes-when a cell divides, its chromatin fibers condense, becoming visible as they compact • Human Body = Has how many chromosomes? • Each chromosome may contain hundreds of genes

  7. Chromosomes and Cell Division continued… • Sister chromatids-two identical joined copies of chromosomes. • Centromere-the region where the two chromatids are joined tightly together. *Draw Figure

  8. Cell Cycle • Cell Cycle-Eukaryotic cells that divide and undergo an orderly sequence of events. • Interphase-the stage during which a cell carries out its metabolic processes and performs its functions. • The cell may spend as much as 90 percent of the cell cycle in interphase.

  9. Cell Cycle continued. • Cell Cycle includes = • Interphase and the M Phase (Mitosis) • Interphase is divided into: • 1. G1 phase-cell grows • 2. S phase-genetic material is duplicated • 3. G2 phase-cell prepares to divide • 4. M phase (Mitosis) is divided into • Prophase • Metaphase • Anaphase • Telophase/Cytokinesis *Goes in order from 1 through 4.

  10. Draw Figure

  11. Mitotic Phase • Mitotic phase-the stage of the cell cycle when the cell is actually dividing. • Includes two processes: • Mitosis and cytokinesis

  12. Mitotic phase continued… • Mitosis-the nucleus and the duplicated chromosomes divide and are evenly distributed forming two “daughter” nuclei. • Unique to eukaryotes

  13. Mitotic phase continued… • Cytokinesis-process by which the cytoplasm is divided into two. • Video

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