Homework: Homework Packet #7 Warm up: Describe 1 time a cell would need to divide in your body Flush: What is one of your earliest childhood memories? Homework: Homework Packet #7
Agenda Injury Healing Discussion and Video Cell Division Checklist Mitosis Phases Discussion Mitosis Practice
How do cuts heal? Think about a time you were injured or got a cut/scrape/burn Talk about your injury with your group Write 3 bullet points in the box about how your injury healed https://www.youtube.com/watch?v=fhh51ELwikU
Reasons for Mitosis 1. Growth 2. Maintenance 3. Repair* Mitosis is cell division which is used to keep the cells in our body healthy, grow, and heal injuries
Cell Division Checklist GOAL OF MITOSIS: Produce two healthy cells with the proper amount of DNA As a group, brainstorm 4 things that must happen before a cell should be able to divide
Review of the Phases of Mitosis (I pee more after tea) Interphase is the longest Consists of G1, S, G2 DNA replication occurs during S Prophase Metaphase (middle) Anaphase (apart) Telophase Cytokinesis
Interphase (review from yesterday) Occurs BEFORE Mitosis LONGEST phase Preps the cells for division 3 parts: G1, S, G2 DNA replication occurs during the S phase
For today, we will focus on the M Phase
Nuclear membrane breaks down Prophase Nuclear membrane breaks down DNA wraps around proteins to form chromosomes (x shape)
Spindle fibers attach to chromosomes Metaphase (middle) Spindle fibers attach to chromosomes Chromosomes line up in the middle of the cell
Chromosomes break apart Anaphase (Apart) Chromosomes break apart Each ‘half of an X’ moves to opposite sides of the cell
Telophase Chromosomes move further apart Two new nuclei begin to form
Cytokinesis Division of the cytoplasm When the new cells physically split apart Animals-microtubules pinch cells apart Plants- cell plate forms
Mitosis POGIL Find the answers in the pictures, in the text, and in your brain! Work as a TEAM…meaning, every person in the group is on the exact same question at the exact same time Due at the end of class for a 25-point formal grade!
Mitosis in Humans Mitosis in humans is used for growth, repair, and maintenance The goal of mitosis is to make the EXACT SAME cell Muscle cell with 46 chromosomes2 muscle cells with 46 chromosomes each
Mitosis in Plants They complete all the same phases of an animal cell The cell wall is a tough, rigid structure that is hard to divide during cytokinesis So, a cell plate forms that will eventually divide the cytoplasm into two new separate cells during cytokinesis
Mitosis in Bacteria Bacteria actually reproduce through mitosis! This is called asexual reproduction Advantages: Faster, larger population size, simpler process, less mistakes Disadvantages: Lack of genetic variation Less likely to survive large changes in the environment
Life of a Chromosome FOLLOW DIRECTIONS- work in the specific order that is outlined on your sheet **Remember- the story is being told from the perspective of a chromosome in the cell Make sure that stays consistent, don’t just describe the phases of mitosis- think about what a chromosome would ‘think’