Name: Block: Date: Science 9: Ch 3.1 - Meiosis
Chapter 3.1 – Meiosis Notes Read textbook pg.74-­‐77 and watch the video to complete the notes and answer the questions: https://www.youtube.com/watch?v=16enC385R0w (Phases of Meiois – Bozeman Science: Mr. Andersen) Introduction and chromosomes Multicellular organisms that reproduce sexually have two types of cells (1) somatic cells -­‐ what is another name for somatic cells? body cells -­‐ how many chromosomes do human somatic cells contain? 46 -­‐ how many pairs of chromosomes? 23 (2) gametes -­‐ what is another name for gametes? sex cells -­‐ how many chromosomes do human gametes contain? 23 -­‐ male gametes are called sperm and female gametes are called eggs or ova (ovum = 1) -­‐ draw a picture of the male gamete and the female gamete *remember, gamete cells have HALF the number of chromosomes as somatic cells. How many chromosomes do the following organisms have? goldfish = 94 fruit fly = 8 human = 46 dog = 78 What is the name of the process that produces gametes? meiosis What is the name of the cells that produces gametes? reproductive cells In the diagram to the right, identify the haploid cells and the diploid cells. What is used to symbolize haploid cells? n What is used to symbolize diploid cells? 2n If the diploid somatic cells of a fruit fly have 8 chromosomes, how many chromosomes will its haploid gametes have? 4 The chromosomes in a diploid somatic cell are arranged in pairs. Each chromosome in the pair is the same as its ‘partner’. These pairs are called homologous chromosomes. Stages of Meiosis Watch the video to label the diagram and answer the questions: https://www.youtube.com/watch?v=16enC385R0w (Phases of Meiois – Bozeman Science: Mr. Andersen) Sci 9: 3.1 Meiosis Notes 1
Name: Block: Date: If the chromosome on the left is from one of the male parent cell, its homologous chromosome on the right comes from the female parent cell. Both chromosomes in a pair of homologous chromosome carry genes that code for the same characteristic. Label interphase, prophase, metaphase, anaphase and telophase the picture of mitosis and meiosis I and meiosis II. Draw the resulting daughter cells. Which phase is not shown here? prophase I PMAT x2 What is “crossing over”? When does it happen? Part of the chromosome from “mom” and “dad” cross over and switch in Prophase 1 – create new chromosome for child.
Sci 9: 3.1 Meiosis Notes 2
Name: Block: Date: Stages of Meiosis Label interphase, prophase, metaphase, anaphase, telophase and daughter cells on the picture of mitosis and meiosis I and II. Mitosis Meiosis I Meiosis II Sci 9: 3.1 Meiosis Notes 3