The process of asexual reproduction begins after a

The process of asexual reproduction begins after a sperm fertilizes an egg.

Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cell that reproduce by asexual reproduction reproduce constantly.

Animated Mitosis Cycle http: //www. cellsalive. com/mitosis. htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis

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 • Nucleus CELL MEMBRANE Cytoplasm

Interphase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Prophase 1 st step in 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. • Sister chromatids Centrioles Spindle fibers

Prophase Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Telophase 4 th step in Mitosis Two new nuclei form. • Chromosomes appear as chromatin (threads rather than rods). • Mitosis ends. • Nuclei Chromatin Nuclei

Telophase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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

Cell Cycle 18

Mitosis Animation http: //www. cellsalive. com/mitosis. htm

Closing: Dear Absent Student Pretend one of your friends from this class was absent today. Write him/her a letter that summarizes what we talked about in class today. Your letter should be at least ONE paragraph long!

Bell Ringer #9/10 12/7/16 What would happen if cytokinesis occurred without mitosis?

Opening: Mitosis Video Clip https: //www. youtube. com/watch? v=C 6 hn 3 s. A 0 ip 0

Work Session: Modeling Mitosis Using your kits, model the cell division process of mitosis.

Closing: What’s wrong with this picture?

Bell Ringer #10/11 12/8/16 Draw what happens during Metaphase in mitosis.

Opening: Meiosis https: //www. youtube. com/watch? v=to. WK 0 f. Iy Fl. Y

Work Session: Directed Reading Read p. 126 -132 Answer Directed Reading questions on a SEPARATE sheet of paper.

Closing: Think-Pair-Share How are mitosis and meiosis different and/or similar?