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Chapter 4 Section 3 Get book and Open to page 124

Chapter 4 Section 3 Get book and Open to page 124. Anticipatory Set. Cell Division. Big Idea. California Standards. Science Standard 7.1.e: Cells divide to increase their numbers through a process of mitosis, which results in two daughter cells with identical sets of chromosomes.

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Chapter 4 Section 3 Get book and Open to page 124

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  1. Chapter 4 Section 3Get book and Open topage 124

  2. Anticipatory Set

  3. Cell Division Big Idea

  4. California Standards Science Standard 7.1.e: Cells divide to increase their numbers through a process of mitosis, which results in two daughter cells with identical sets of chromosomes. Science Standard 7.2.e: DNA is the genetic material of living organisms and is located in the chromosomes of each cell. Paraphrase: • Cells divide and make identical copies of themselves.

  5. Input • Cell cycle: the regular sequence of growth that cells undergo • Interphase: The first stage of the cell cycle(usually last the longest) • replication: the process in which cells make exact copies of the DNA and nucleus • Mitosis: The second stage of the cell cycle • chromosomes: Double rod structures that are created during prophase • cytokinesis: The final stage of the cell cycle

  6. Input Stage 1: Interphase • Growing- • Cell grows to its full size and produces structures it needs • Ex: cell makes new ribosomes and produces enzymes; copies are made of both mitochondria and chloroplasts. • Copying DNA- • The cell makes an exact copy of the DNA in it’s nucleus (replication) • The chromatin appears as dense mass within a clearly defined nucleus. • At the end of DNA replication, the cell contains two identical sets of DNA. • Preparing of Division- • Cells produce structures that it will need to divide into two new cells. • At the end of Interphase the cell in ready to divide.

  7. Input Stage 2: Mitosis • The stage during which the cell’s nucleus divides into two nuclei. • During Mitosis on copy of the DNA is distributed into each of the two daughter cells. • Scientists divide Mitosis into four PHASES: PROPHASE, METAPHASE, ANAPHASE, AND TELOPHASE

  8. Input Stage 2: Mitosis • Prophase- • Chromatin in the nucleus condenses to form chromosomes. • The pairs of centrioles move to opposite sides of the nucleus. • Spindle fibers form a bridge between the ends of the cell. • The nuclear envelope breaks down. • Metaphase- • The chromosomes line up across the center of each cell. • Each chromosome attaches to a spindle fiber at its centromere.

  9. Input Stage 2: Mitosis • Anaphase- • The centromes split • The Two chromatids separate, and each new chromatid becomes a new chromosome. • The new chromosomes move to the opposite ends of the cell. • The cell stretches out as the opposite ends are pushed apart • Telophase- • The chromosomes begin to stretch out and lose their rod like appearance. • A new nuclear is forms around each region of chromosomes. • The DNA is once again separated from the cytoplasm by a membrane.

  10. Input Stage 3: Cytokinesis • The cytoplasm divides. The organelles are distributed into each of the two new cells. • Usually starts about the same time as telophase. • When Cytokinesis is complete, two new cells, or daughter cells, have formed. • Each daughter cell has the SAME number of chromosomes as the original parent cell. • At the end of cytokinesis , each cell enters interphase, and the cycle begins again.

  11. Finish the Front of Notes on your own • Across Disciplines: Math • Patterns: Draw a picture of the stage • Question: Write a question and answer it. • Different Perspectives: The differences in cell division from an animal cell and plant cell • Summary: Write a summary of what you have learned.

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