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3/2/16 Materials Needed: Binder, Pencil LS-7 Homework: # 53 DO NOW: What is the primary advantage of sexual reproduction (meiosis) over asexual reproduction (mitosis)? Use complete sentences. Agenda: 1. Do Now (5) Give homework 2.1.Experiment (10) 3. Dismiss (3)the #52 to materials manager to turn in. Objectives 2. Write down the • Scientists will in be homework able to describe your agenda. the basic rules and 3.procedures Do the DOofNOW. 6th science. 4.grade If you finish early, thumbs up. Today’s Agenda • • • • • Objectives Mitosis and Meiosis Introduction Lab Discussion Homework: #52 Objectives Scientists will be able to create a model to represent different types of cell division. Writing and speaking: Students will describe cell division. What are we doing? We are learning about cell division. Why are we doing it? In order to understand how we grow and develop differently, we need to examine the processes of cell division. How do I know you’ve got it? When you can explain the purpose of each type of cell division, you’ve got it! Zygote: the cell that results from two sex cells combining. It has one set of chromosomes from each of the gametes. Zygote: the cell that results from two sex cells combining. It has one set of chromosomes from each of the gametes. Asexual Reproduction: Mitosis • Cell division and reproduction can occur in two ways - mitosis and meiosis. • Mitosis is a process of cell duplication, or reproduction, during which one cell gives rise to two genetically identical daughter cells. • Mitosis is used by single celled organisms to reproduce; it is also used for the organic growth of body cells, tissues, and fibers. • Mitosis creates cells identical the original cell. Sexual Reproduction: Meiosis • Meiosis is a division of a cell involving two divisions of the chromosomes and giving rise to four gametes, or sex cells, each possessing half the number of chromosomes of the original cell. • Meiosis is useful for sexual reproduction of organisms. The male and female sex cells, e.g. the sperm and egg, fuse to create a new, singular biological organism (Zygote). • Meiosis creates cells with different combinations of DNA from the original cell. This leads to genetic variability. Vocabulary: Don’t get confused! • Gamete: sex cell, one for female, one for male • Zygote: the cell that results from fertilization of two gametes (sex cells) that has 2 copies of chromosomes (one from each sex cell). • Fertilization: Male gamete and Female gamete fuse to create a zygote Mitosis and Meiosis! • In pairs, you are creating a model using the provided materials to demonstrate the process of cell division. First you must create a plan and have the plan approved, then you will create your model. Your models will be shared with the class. • How to get the A+: What are our expectations today? Which of the following is the primary advantage of sexual reproduction when compared to asexual reproduction? A. There is a greater number of offspring B. There is more food available to offspring C. There is a genetic variety in offspring D. There is a longer development time for offspring Which of the following is an example of asexual reproduction? A. Turtles lay fertilized eggs in a pit in the sand. B. Seeds form in pine cones after pollen reaches the cones. C. Fish release egg cells and sperm cells at the surface of the water. D. Trees send out root-like extensions that produce new stems. HW: #53 Step 1: Login to google classroom and find our class. Step 2: Watch the video link provided for you. Step 3: Fill out the HW 53 document on google classroom and submit it for a grade. Your work must be your own! Scientist of the Day