Asexual Reproduction Mitosis DSQ Mitosis is the process

Asexual Reproduction Mitosis DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals? Mrs. Camp 7 th Grade Life Science 1 1

How do little elephants grow up to be BIG elephants?

Why do animals shed their skin?

The process of asexual reproduction (cell life cycle) 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 Cell Life Cycle http: //www. cellsalive. com/mitosis. htm Cell Life Cycle Stages • Interphase • M 1 - Prophase • M 2 - Metaphase • M 3 - Anaphase • M 4 - Telophase • Cytokinesis

Interphase occurs BEFORE mitosis begins Chromosomes and ALL organelles are copied. • Chromosomes appear as threadlike coils (chromatin) at the start, but are almost invisible with a light microscope. • Nucleus CELL MEMBRANE Cytoplasm

Interphase What differences do you see? Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

M 1 - Prophase 1 st step in Mitosis begins. Chromosomes visible. • Centrioles (or poles) appear and begin to move to opposite end of the cell. (Not in Plants) • Spindle fibers form between the poles. • Sister chromatids Centrioles Spindle fibers

M 1 - Prophase What differences do you see? Animal Cell Plant Cell Spindle fibers Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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

M 2 - Metaphase What differences do you see? Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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

Anaphase What differences do you see? Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

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

Telophase What differences do you see? 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 Cell Life Cycle - Review Interphase M 1 -Prophase M 2 - Metaphase M 3 - Anaphase M 4 - Telophase Cytokinesis

Plant Cell Life Cycle -- Review Interphase M 1 - Prophase M 2 - Metaphase M 3 - Anaphase M 4 - Telophase Cytokinesis Cell Wall Plate Forms

Cell Life Cycle- Animal Cell 21

The Cell Cycle - Cell Division 22 22

Cell Life Cycle Animation http: //www. cellsalive. com/mitosis. htm