BIO 101 _ Student Exploration: Meiosi _ Gizmos | Student Exploration: Meiosis_2022

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Name: Mria Date: Nov 18th Student Exploration: Meiosis Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: anaph... ase, chromosome, crossover, cytokinesis, diploid, DNA, dominant, gamete, genotype, germ cell, haploid, homologous chromosomes, interphase, meiosis, metaphase, mitosis, ovum, phenotype, prophase, recessive, sister chromatid, sperm cell, telophase, zygote Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. During mitosis, a single cell divides to produce two daughter cells. What must happen in the original cell so that each of the daughter cells has a complete set of chromosomes? DNA Replication 2. During sexual reproduction, two sex cells fuse to create a fertilized cell with a complete set of chromosomes. What must be true about the number of chromosomes in each sex cell? They get equally divided Gizmo Warm-up Meiosis is a type of cell division that results in four daughter cells with half as many chromosomes as the parent cell. These daughter cells mature into gametes, or sex cells. In the Meiosis Gizmo, you will learn the steps in meiosis and experiment to produce customized sex cells and offspring. On the STEPS tab, click Male. You are looking at a germ cell, or a cell that will undergo meiosis to become gametes. 1. Read the description of interphase at the bottom of the Gizmo. What happens to the cell at the beginning of interphase? Cell grows and develops 2. Click on the DNA in the nucleus of the cell. Describe what happens. The DNA replicates and the cell keeps growing 3. Why is it necessary for the cell to grow and duplicate its DNA before the start of meiosis? So every cell has the same size and amount of chromosomes Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved This study source was downloaded by 100000831988016 from CourseHero.com on 04-10-2022 10:32:32 GMT -05:00 https://www.coursehero.com/file/121742957/Meiosis-Gizmospdf/ Activity A: Steps in meiosis Get the Gizmo ready: ● Make sure the STEPS tab is selected. ● If necessary, choose the Male cell. Click on the DNA to copy it to proceed to prophase I. Introduction: Unlike mitosis, which produces two identical daughter cells from one parent cell, meiosis creates four unique daughter cells with half the amount of DNA as the parent cell. Question: How does meiosis create four daughter cells from one parent cell? 1. Observe: (Prophase I) Click on the nucleus to break it down then click on the DNA to condense it into chromosomes. Drag the centrosomes to the top and bottom of the cell. A. How many chromosomes does this cell have? Four Each chromosome consists of a pair of sister chromatids, two identical strands of DNA that formed when DNA replicated during interphase. B. On the image to the right, ✏️ Draw two lines connecting the pairs of homologous chromosomes (chromosomes of similar size with a matching set of genes). Click the image to select EDIT to use the drawing tool. In the Gizmo, drag the homologous chromosomes together. Click Continue. 2. Observe: (Metaphase I and Anaphase I) - Drag the groups of homologous chromosomes to the metaphase plate, then drag spindle fibers from each of the centrosomes to the chromosomes. Click the centrosome to pull the chromosomes apart. How do the chromosomes separate in anaphase I? The spindle fiber pull them to the opposite sides of the cell 3. Compare: An image of the anaphase step in mitosis is shown to the right. A. How does anaphase I in meiosis differ from anaphase in mitosis? Sister chromatids are stilltogether B. At the end of anaphase I (meiosis), how many chromosomes are on each side? 2 Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved This study source was downloaded by 100000831988016 from CourseHero.com on 04-10-2022 10:32:32 GMT -05:00 https://www.coursehero.com/file/121742957/Meiosis-Gizmospdf/ 4. Observe: Telophase I and cytokinesis are the final steps of the first half of meiosis. A. Describe what happens when you click on the chromosomes during telophase I. They unravel B. Click and drag on the contractile ring. Describe what happened during cytokinesis. The cell separates and becomes two 5. Observe: Go through the steps of the second half of meiosis until you reach the end of telophase II, following the instructions at the top right corner. As you proceed, answer the questions below. Use the Back button if you need to see a step again. A. Before prophase II begins, does the DNA in the cell duplicate itself? No B. During metaphase II, do homologous chromosomes pair up as in metaphase I? No C. How does anaphase II differ from anaphase I? The sister chromatids separate in anaphase 2 D. At the end of anaphase II, how many chromatids are on each side of the cell? 2 E. Are all of the cells the same size? Yes The original parent cell is called diploid because it contains a complete set of homologous chromosome pairs. Each of the four daughter cells is haploid, meaning that each contains half of the original parent cell’s chromosomes. Each daughter cell contains one chromatid from each homologous pair. 6. Observe: Click on the spermatids. Spermatids that formed from meiosis will develop into mature male gametes called sperm cells. Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved This study source was downloaded by 100000831988016 from CourseHero.com on 04-10-2022 10:32:32 GMT -05:00 https://www.coursehero.com/file/121742957/Meiosis-Gizmospdf/ Mature sperm cells have only a small amount of cytoplasm and use their flagella, or “tails,” to propel themselves forward. Sperm are designed for one purpose, to deliver genetic material to the egg cell during fertilization. Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved This study source was downloaded by 100000831988016 from CourseHero.com on 04-10-2022 10:32:32 GMT -05:00 https://www.coursehero.com/file/121742957/Meiosis-Gizmospdf/ Activity B: Comparing female and male gametes Get the Gizmo ready: ● Make sure the STEPS tab is selected. ● Click Reset. Introduction: Although both male and female gametes contain genetic material from the parent organism, they perform different functions. A male gamete delivers genetic material to a female gamete. The fertilized female gamete, called a zygote, then grows into the offspring. Question: What are the differences in meiosis between male and female cells? 1. Compare: Click on the Female button. For the female cell, proceed through meiosis until you reach the end of anaphase I. Up to this point, did you notice any differences between the development of male and female gametes? Explain. No they are going through the same process so they look no different 2. Compare: Proceed through telophase I and cytokinesis I. A. What do you notice about the size of the two [Show More]

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