2 How did I grow taller?How are my worn out cells replaced?How do I heal from injuries?The answer is….Cellular Reproduction or Mitosis
3 THE CELL CYCLE: Cells go through cycles during their lifetime. Cells spend MOST of their time in a stage of growth and development called Interphase
4 InterphaseCells grow in size and number oforganelles. This is the Growth andDevelopment stage.Chromosome Replication Cell Reproduction (Mitosis) Prepare for cell reproduction (Mitosis)
5 Mitosis1. Type of cell division when chromosomes are duplicated and then separate into two identical and complete sets to be passed to each of the two daughter cells.2. In this type of cell division, the hereditary information is identical in all the cells that result.
6 Responsible for growth, maintenance and repair. In some one-celled organisms, asexual reproduction is achieved through mitosis.5. Cancers are a result of abnormal cell division.
7 meiosis 1. Responsible for producing egg and sperm 2. The resulting daughter cells contain one-half the hereditary information.
8 Key words Cell membrane: Controls what enters and leaves the cell Nuclear membrane: Controls what enters and leaves the nucleusChromosomes: Contains the DNACentromere: Holds the Chromosomes togetherCentriols: Pulls the chromosomes apart
9 Steps of mitosis:During Interphase, chromosomes are copied (the number doubles). Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy change to sister chromatids at the end of this phase.During Prophase, nuclear membrane breaks apart. Centrioles begin to move to opposite ends of the cell. Spindle fibers form between the centrioles (at the poles of the cell).
10 Diagrams of Interphase and the start of Mitosis: Prophase
11 Diagrams of Metaphase, Anaphase, Telophase (the final stage of Mitosis), and Cytokinesis
22 RESULT OF A MITOSIS DIVISION: Number of chromosomes in each of the two resulting daughter cells is the same as the amount of chromosomes in the original parent cell.For example: In fruit flies the parent cell has 8 chromosomes. After mitosis, each new daughter cell has 8 chromosomes.