Name KEY Date Period Chapter 8: Cell Reproduction Review (Mitosis and Meiosis) Test Format (55 points): 18 Multiple Choice 10 Completion 7 Mitosis, Meiosis or Both 6 Matching 16 Diagrams Section 8.1 – Chromosomes 1. In the figure to the right, label the following terms: Homologous chromosomes Chromatids Centromere What to Study: Ch 8 Notes Cell Cycle and Mitosis WS Cell Cycle Coloring Mitosis Website Lab Meiosis WS Mitosis vs. Meiosis WS centromere 2. What is the figure to the right a picture of? KARYOTYPE Draw a HUGE CIRCLE around all the pairs that are AUTOSOMES. Draw a SQUARE around the pair that are the SEX CHROMOSOMES. Is this a picture of a male or female’s chromosomes? How do you know? MALE, XY 3. Cells that are DIPLOID (or 2n) include all your body cells; they have 2 copies of each chromosome, one from your mom and one from your dad. 4. Cells that are HAPLOID (or n) include only your gametes, or your SEX cells; they have only 1 copy of each chromosome. 5. The diploid number for a human is 46, while the haploid number for a human would be 23. Section 8.2 – Mitosis 1. The cell cycle is the sum of three processes: interphase (preparation for cell DIVISION) mitosis (division of the NUCLEUS) and cytokinesis (division of the CYTOPLASM). 2. Actual cell division is the sum of two of the three processes mentioned above, the MITOSIS phase and the CYTOKINESIS phase. 3. The three parts of interphase are G1 (when the cell grows), S (when the DNA duplicates) and G2 (when the organelles duplicate). 4. The four phases of mitosis IN ORDER are: PROPHASE, METAPHASE, ANAPHASE, and TELOPHASE. 5. PROPHASE is the phase of mitosis where chromatin condenses down into chromosomes and the nuclear membrane and nucleolus disappear. Also in this phase, the SPINDLE fibers appear from the CENTRIOLES, but only if the cell is an animal cell. 6. METAPHASE is the phase of mitosis where the sister chromatids, attached at the CENTROMERE, line up at the metaphase plate. 7. ANAPHASE is the phase of mitosis where the sister chromatids break free of one another and move to opposite poles. (centromere divides) 8. TELOPHASE is the last phase of mitosis. During this phase, the chromosomes uncoil back down into CHROMATIN and the nuclear membrane and nucleolus reform. 9. PROPHASE is the longest phase of mitosis. 10. PROPHASE is almost the exact opposite of telophase. 11. Cytokinesis is the division of the cytoplasm. In a plant cell, a CELL PLATE forms, while in an animal cell, a CLEAVAGE FURROW forms to divide the new daughter cells. 12. If a parent cell has 100 chromosomes at the beginning of mitosis, what would be produced at the end of the cell cycle (fill in the questions below)? How many daughter cells are formed? 2 Are the cells identical or genetically different? IDENTICAL How many chromosomes in each daughter cell? 100 Section 8.3 - Meiosis 1. The purpose of meiosis is to produce GAMETES, or sex cells. 2. Prophase I of meiosis is very different than mitosis because during this phase, homologous chromosomes (chromosomes that are the same size and shape) find each other and form TETRADS. 3. Crossing over can occur when homologous chromosomes are next to each other in a tetrad; this can occur during the PROPHASE I phase of meiosis. 4. Crossing over is very important because it helps to create genetic DIVERSITY. 5. What are the four main phases of meiosis I? PROPHASE I, METAPHASE I, ANAPHASE I, TELOPHASE I 6. What are the four main phases of meiosis II? PROPHASE II, METAPHASE II, ANAPHASE II, TELOPHASE II 7. During anaphase I, the TETRADS get separated, and during anaphase II the SISTER CHROMATIDS get separated. 8. Gametes are HAPLOID (diploid or haploid) and they include SPERM (male gamete) and EGG (female gamete). 9. An organism has 100 chromosomes in its body cells. At the end of meiosis, what would be produced? Answer the questions below! How many chromosomes will there be in this organism’s gametes? 50 How many sperm will be produced at the end of meiosis? 4 How many usable eggs will be produced at the end of meiosis? 1 (THE OOTID) Mitosis, Meiosis or Both? Decide whether each of the following statements refer to mitosis, meiosis, or both. Place a checkmark in the appropriate box(es). 1. Mitosis X Produces two daughter cells Meiosis 2. 2 divisions of DNA occur X 3. Produces 4 daughter cells X 4. Reduces the chromosome number by half X Both 5. Begins with a diploid cell X 6. Produces identical cells X 7. Produces genetically different cells X 8. DNA gets copied during S phase X Diagram. Label the following diagram with the words shown below. Anaphase Cell Division Cytokinesis G1 G2 Interphase Metaphase Mitosis Nuclear Division Prophase S Telophase Interphase G1 S CELL Cytoplasm Division CYCLE Cytokinesis G2 T MITOSIS Nuclear Division Cell Division A M P Drawing. Starting with a cell with a diploid number of FOUR (so prophase in all cases would start with FOUR X’s because the chromosomes would have duplicated during S phase of interphase), please draw what the cells would look like in PMAT of mitosis, meiosis I and meiosis II. MITOSIS PROPHASE METAPHASE ANAPHASE TELOPHASE MEIOSIS I MEIOSIS II Show crossing over in one tetrad!! Do this part after meiosis I!!