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Lesson in science mitosis

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lesson plan for grade 8
topic: stages of mitosis

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Lesson in science mitosis

  1. 1. LESSON PLAN IN SCIENCE (GRADE 8) Teacher: Frederick E. Macaso Date:_____________ Subject area:Science – Living things and Environment Grade Level: Grade 8 Topic: The cell cycle- Mitosis Time:__________ CONCEPTS  Cell cycle has three stages: Interphase, mitosis and cytokinesis  Interphase has three parts: G1 or Gap 1 phase, S phase or synthesis phase and G2 phase or Gap 2 phase.  Mitosis has 4 phases: Prophase, Metaphase, Anaphase and Telophase.  Cytokinesis is the division of cytoplasm to form two daughter cells immediately after mitosis. OBJECTIVES Given a pictures/diagrams of cell cycle, the grade 8 students can do the following with at least 75% of proficiency, within 60 minute class period: a. Analyze the three stages of cell cycle b. Identify the different stages of mitosis and; c. State the importance of mitosis in cells CONTENT STANDARD/S The learner demonstrate an understanding of a. How cells divide to produce new cells. LESSON PROPER Prerequisite: Chromosomes; sister chromatids Materials: Diagrams of the cell cycle Diagrams of the different stages of mitosis Mitosis phase worksheets Procedure: 5E’s TEACHER’S ACTIVITY STUDENT’S ACTIVITY ENGAGE (Shows a picture of Naruto doing the Kage Bushin Technique- or the shadow clone of ninja) Are you familiar with this picture? Who is in the picture? Naruto! Doing the kage bushin technique As you’ve observed, he replicated himself many times. Can you do the same? No. Well, off course not, but do you know something that can clone themselves? Cells (answers may vary) Very good! Every single one of them clones or multiplies by themselves and in fact, they’re doing it right now. From single cell organism to bigger creature, all of them stems from cell’s ability to reproduce themselves.
  2. 2. Why do you think reproduction of cells in our body is essential or important? Because, that’s what allows organism to grow, heal, develop and keep from dying for as long as possible. What do we call this kind of cell division? Mitosis. That’s right. Did you know that mitosis is responsible for a whole lot of your body’s key functions? If you get a cut, you body needs to produce new cells. That’s mitosis! Have too much to drink and damage your liver? You got to replace those cells. That’s mitosis. Tumor growing in your brain? Unfortunately, again, mitosis! When you go from 7 pound baby and now, you’re 100 pound, it’s not your cells that are increasing in mass, but you’re just getting more of them over and over again! So you are made up of cells just like the elephant and the trees. Do you still remember the three major parts of the cell? Nuclear membrane, Cytoplasm and the nucleus That’s right! Now what is the function of nucleus? Nucleus stores DNA. And what is DNA and what does it do? It contains all the instructions on how to build organisms. (post the diagram of the organization of the DNA) As you can see, DNA is organized as beads and strings to form chromosomes. Now do you remember how many chromosomes do you have in each cell? 46 chromosomes or 23 pairs of chromosomes -half comes from your father and the other half, from your mother. During mitosis, the cell with 46 chromosomes to split into two cells, that are genetically identical. Since the nucleus has all the necessary instruction for the cell to survive, we don’t need to duplicate the whole cell. Instead, mitosis, is simply duplicating the DNA that is stored in the nucleus. EXPLORE Now we are going to find out how mitosis takes place by doing the following activity. But first let me introduce you the CELL CYCLE. (post the cell cycle diagram on the board) As you can see, obviously, it’s a cycle of a cell. How many phases does a cell cycle have? And what are they? Three! Interphase, Mitotic Phase and Cytokinesis. All right! Now the Interphase, as you can see, are divided into 3 sub phases, which are the G1 or what we called the Gap 1, The S phase or the synthesis phase and the G2 or the Gap 2 phase. What do you think is happening to the cell during G1 phase? Cell grows initially That’s right! How about in the S phase? DNA replicates into sister chromatids
  3. 3. And the G2? The cell rapidly grows and prepares for the cell division! That’s right! And how does division takes place? You discover it by yourselves. (Distributes the activity sheets) Who can read the instructions? Student reads the instructions You only have 10 minutes (or less) to finish the activity If you have any questions, please raise your hand. EXPLAIN Which picture best describes interphase? Letter D What do you think is happening during interphase? Cell duplicates, cell grows Which picture best describes prophase? Letter C Why do you think its letter c? Because chromosomes are starting to get visible like long threads; network of spindle fibers starting to form. Very good! Now how about pro- metaphase? Letter f! Why do you think it’s letter f? Because the chromosomes starts to move towards the middle or equator of the cell. Good, no how about metaphase? Letter B! Why? The chromosomes lined up at the equator of the cell. Great! What picture best describes anaphase? Centromeres divide and chromosomes move toward opposite poles of the cell. How about the telophase? Letter A Why do you think its letter A? Chromosomes decondense; chromosomes have reached the opposite poles of the cell. And lastly, the cytokinesis? Letter A! Correct! It’s also letter A! why do you think so? Cleavage furrow starts to form at the equator of the cell. Why is it essential part of the cell cycle? Because it is the process where cytoplasm divides into two. Very good! And the result as you can see, from one cell to two daughter cell, hence, cell division. ELABORATE Now, we already know how cell duplicates itself. Why do you think mitosis is very important? It’s important because it’s responsible for the growth, repair and development of our cell and all the key functions of the cell. Correct, so, when we get a cut, as what I’ve mentioned earlier, it’s the job of the mitosis to replace or repair the damage tissues. Now, cancers or tumors are also caused by mitosis, what might be the cause? It’s because of the some cells escapes from cell cycle regulation and divides uncontrollably. That’s right you will learn more about these in your higher grades. EVALUATION
  4. 4. DIRECTION: Choose the letter of the correct answer. 1. The following are the major phases/stages of the cell cycle, except a. Cytokinesis b. Interphase c. Mitotic phase d. None of the above 2. Phase of mitosis where chromosomes are aligned in the middle or equator of the cell. a. Interphase b. Prophase c. Metaphase d. Telophase 3. What is the major function of mitosis? a. To make the cell bigger in mass b. To protect the cell from foreign materials c. To produce two cells d. To nourish the cell 4. How many chromosomes does a human have? a. 23 b. 46 c. 56 d. 43 5. It is the phase of the cell cycle where chromosomes are being duplicated. a. G1 phase b. S phase c. G2 phase d. Cytokinesis 6. What causes cancer? a. When the cell fails to divide b. When the chromosomes are not in pairs c. When the nucleus die. d. When cell divides abnormally or uncontrollably. 7. What is happening during telophase? a. The chromosomes reached the opposite ends of the cell. b. The spindle fibers start to form. c. The cell starts to grow and prepare for division d. The chromosomes form into sister chromatids. 8. Arrange the steps or stages of cell cycle in order a. G1 phase- S phase- G2 phase- Prophase- Anaphase - Metaphase- Telophase- Cytokinesis b. G1 phase-S phase-G2 phase- - Prophase- Metaphase- Anaphase- Cytokinesis- Telophase c. G1 phase-S phase-G2 phase - Prophase- -Metaphase- Anaphase - Telophase- Cytokinesis d. G1 phase-S phase-G2 phase - Prophase- Metaphase- Telophase- Anaphase –Cytokinesis 9-10. Give briefly descriptions of each of the phases of cell cycle that will distinguish it from the other. Interphase: __________________ Mitotic Phase: ________________ Cytokinesis: __________________ Assignment: 1. Read about Meiosis. 2. What is the major difference between mitosis and meiosis? 3. What is the importance of meiosis?

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