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Download Mitosis process of a cell dividing to produce an exact copy of itself
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Bell Work: 2/4/2015 For your answer, draw all the three pictures and explain why the third picture you chose is correct. Objectives • Describe the relationship among genes, chromosomes, and inherited traits. (SPI 0707.4.3) • Sequence a series of diagrams that depict chromosome movement during plant cell division. (SPI 0707.1.4) Mitosis Review 1. Interphase- DNA is copied 2. Prophase- Chromatin (DNA wrapped around protein) forms into chromatids 3. Metaphase- Chromatids line up in the middle of the cell 4. Anaphase- Chromatids separate 5. Telophase- two new nuclei form around the chromatin 6. Cytokinesis- two new cells form Mitosis: process of a somatic (body) cell dividing to produce an exact copy of itself Create the Phases of Mitosis • Use the cards at your group to sequence a series of diagrams that depict chromosome movement during cell division (mitosis) on your desk. Label each box with the phase name and draw each phase in the boxes on your note sheet. Mitosis Interphase DNA is copied (in chromatin form) Centrioles copy Animal Cell chromatin Plant Cell Mitosis Prophase DNA condenses into chromatids Spindle fibers begin to form Centrioles move to opposite sides chromatids Nuclear membrane breaks apart Animal Cell Plant Cell Metaphase Chromatids (chromosomes) line up across the center of the cell Spindle fibers attach to the spindle fibers centromeres (center of the chromsome) Mitosis Animal Cell Plant Cell Mitosis Anaphase Spindle fibers pull the chromatids to opposite ends of the cell Animal Cell Plant Cell Mitosis Telophase Two new nuclei form around the chromatids Chromosomes unwind back into chromatin Animal Cell Plant Cell Cytoplasm still attached Mitosis Cytokinesis Division of the cytoplasm and the rest of the cell Two new daughter cells! Animal Cells Plant Cells Meiosis In sexual reproduction, two parent cells join together to form offspring that are different from both parents. These parent cells are called sex cells (sperm & egg). Sex cells are made during meiosis. Challenge Question • If sex cells, created during meiosis, are part of sexual reproduction where two parent cells join together to form offspring that are different from both parents, what type of reproduction would the cells in mitosis be a part of if they come from one cell and are identical to the parent cell? ASEXUAL REPRODUCTION Meiosis process of a cell dividing to produce 4 cells with half the genetic material Why do the cells produced in meiosis only need half of the genetic material? Meiosis Interphase I DNA copies Centrioles copy Prophase I DNA organized into chromatids Spindle fibers form Centrioles move to opposite sides Nuclear membrane breaks apart Meiosis Meiosis Metaphase I Chromatids line up on each side of the center of the cell Spindle fibers attach Meiosis is a bit different because there something called crossing-over happens with chromosomes the DNA. This crossing over is an exchange of genes. The genes are mixed up, not resulting in a perfect duplicate like mitosis. Meiosis Anaphase I Spindle fibers pull the chromosome pairs apart to opposite ends of the cell Meiosis Telophase I Two new nuclei form Chromosomes unwind (chromatin) Meiosis Cytokinesis Cytoplasm splits Two cells Predict what happens next in Interphase II Cytokinesis Interphase II Keep in mind the four cells at the end of meiosis only get HALF of the genetic material… Meiosis Interphase II Cell rests DNA DOES NOT duplicate Centrioles duplicate Meiosis Prophase II DNA organized into chromatids Spindle fibers form Centrioles move to opposite sides Nuclear membrane breaks apart Meiosis Metaphase II Chromosomes line up across the center of the cell Spindle fibers attach to the chromosomes Meiosis Anaphase II Spindle fibers pull the chromatids to opposite ends of the cell Meiosis Telophase II Two new nuclei form around the chromatids Chromosomes unwind (chromatin) Meiosis Cytokinesis Cytoplasm splits 4 new cells! Each cell with only half of the genetic information Mitosis vs. Meiosis Exit: Mitosis vs. Meiosis Venn Diagram
