Mitosis and the Cell Cycle Cell reproduction

The Cell Cycle The sequence of growth and division of a cell. 95% of cell cycle in interphase 5% of cell cycle in mitosis

Animated Mitosis Cycle Interphase Prophase Metaphase Anaphase Telophase & Cytokinesis

4 Cell Cycle

Interphase occurs before mitosis begins Chromosomes are copied (# doubles) Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase CELL MEMBRANE Nucleus Cytoplasm

Interphase The cell spends most of its life in this phase. During this phase the cell grows in size, does its “job” in the organism, and makes copies of all its organelles.

Interphase Animal Cell Plant Cell Photographs from:

Mitosis

Prophase 1 st step in Mitosis Mitosis begins (cell begins to divide) Centrioles (or poles) appear and begin to move to opposite end of the cell. Spindle fibers form between the poles. Centrioles Sister chromatids Spindle fibers

Prophase Animal Cell Plant Cell Photographs from: Spindle fibers Centrioles

Metaphase 2 nd step in Mitosis Chromatids (or pairs of chromosomes) attach to the spindle fibers. Centrioles Spindle fibers

Metaphase Animal Cell Plant Cell Photographs from:

Anaphase 3 rd step in Mitosis Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers

Anaphase Animal Cell Plant Cell Photographs from:

Telophase 4th s tep in Mitosis Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Chromat in

Telophase Animal Cell Plant Cell Photographs from:

Cytokinesis occurs after mitosis Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase

Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase

Remembering the steps in mitosis. PMXatafIXc PMXatafIXc

Mitosis Pre-AP Tomorrow you teach. –As a group you will need to come up with a unique way to present how mitosis happens. Your students will have some challenges that you will need to overcome as a teacher.

Challenges Don’t speak English Hearing impaired Blind Students cant sit still and needs a physical activity

Mitosis Pre-AP Questions 1) What are the two main phases that occur during the cell cycle? 2) Describe in order the steps that occur during mitosis and cytokinesis and their major changes that occurs. 3) Why is Interphase so important? 4) How is Cytokinesis different in plant cells and animal? 5) How is the genetic material in two daughter cells similar to the genetic material in a parent cell? 6) Create a unique mneumonic device to remember what occurs during each step of Mitosis. 7) Create a question about this topic that you don’t know.

Mitosis 6 th Grade Science 1) What are the two main parts of the cell cycle? 2) How is the genetic material in two daughter cells similar to the genetic material in a parent cell? 3) Draw and describe the steps that occur during a cells life cycle. 4) How is cytokinesis in plant cells similar to cytokinesis in animal cell? How is it different? 5) Why is Interphase so important? 6) Create a unique mneumonic device to remember what occurs during each step of Mitosis.