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Chapter 4

Chapter 4. CELL REPRODUCTION. CELL DIVISION AND MITOSIS. Cell cycle-every cell has a lifecycle – birth, growth and development and death Length of cycle varies. I P M A T. INTERPHASE. When a cell copies its genetic material (chromosomes) in the nucleus and prepares for cell division.

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Chapter 4

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  1. Chapter 4 CELL REPRODUCTION

  2. CELL DIVISION AND MITOSIS • Cell cycle-every cell has a lifecycle – birth, growth and development and death • Length of cycle varies

  3. I P M A T

  4. INTERPHASE • When a cell copies its genetic material (chromosomes) in the nucleus and prepares for cell division

  5. PROPHASE • Nuclear membrane disappears • Centrioles move to opposite ends of the cell in an animal cell • Spindle fibers begin to form in animal and plant cells

  6. METAPHASE • Pairs of chromatids line up across from each other (like football line of scrimmage) • Spindle fibers connect to centomere of each pair of chromatids

  7. ANAPHASE • Spindle fibers pull chromosomes to opposite ends of the cell

  8. TELOPHASE • Spindle fibers disappear • Chromosomes become encased in a new nuclear membrane

  9. TELOPHASE • Cell membrane pinches in and the cytoplasm divides for an animal cell and two new identical cells are formed - cytokinesis • In a plant cell a new cell plate forms as the cell divides and will become a new cell wall for the new cells • Process repeats itself

  10. cytokinesis

  11. RESULTS OF MITOSIS • Two new, identical cells form from mitosis • Mitosis is for growth and repair of organism

  12. ASEXUAL REPRODUCTION • Only one parent needed • Offspring are identical to the parent • Some plants reproduce by sending out shoots or runners, strawberry plant

  13. ASEXUAL REPRODUCTION • Fission – when one organism divides itself in two • Budding – a new organism grows off the side of the parent and then releases when ready • Regeneration – process of regrowing a lost body part, or forming new, identical organisms from the separated body part – seastar or sponges

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