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N-6 Cell Division What do cells spend their time doing? Why do they do this?

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Presentation on theme: "N-6 Cell Division What do cells spend their time doing? Why do they do this?"— Presentation transcript:

1 N-6 Cell Division What do cells spend their time doing? Why do they do this?

2 Cell Cycle: The regular sequence of growth and division that happens in cells

3 Stage 1: Interphase During interphase, the cell grows to its mature size, makes a copy of its DNA, and prepares to divide into two cells Growth – during the first part of interphase, the cell doubles in size DNA Replication – the cell makes a copy of its DNA in the nucleus. This means that there are TWO copies of the DNA (instructions) in each nucleus Cells spend 90% of their lives in this stage

4 Stage 2: Mitosis During mitosis, one copy of the DNA is distributed into each of the two ‘daughter’ cells. This is divided into four parts: Prophase Metaphase Anaphase Telophase

5 Chromosomes: (humans have 23 pairs) DNA Centromere Two Chromatids

6 Mitosis - Prophase Chromosomes are visible

7 Mitosis - Metaphase Chromosomes line up in center of the cell

8 Mitosis - Anaphase Chromatids are pulled to opposite ends of the cell

9 Mitosis - Telophase New nuclear membranes form around each new set of chromosomes

10 Stage 3: Cytokinesis The cell membrane ‘pinches’ together in the middle of the cell forming two ‘daughter’ cells. Cytoplasm divides, distributing the organelles into each of the new cells.

11 Can we identify the following? 1. Prophase 2. Metaphase 3. Cytokinesis 4. Telophase 5. Telophase 6. Metaphase 7. Prophase 8. Anaphase 9. Ana or Telo? 10. Interphase 10

12 DNA Replication DNA Replication ensures that each daughter cell will have all of the genetic information it needs to carry out its activities. There are four pieces of the puzzle: Adenine and Thymine Cytosine and Guanine The order that these ‘pieces’ fit together determine our genetics! Animation


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