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Meiosis lesson
 

Meiosis lesson

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    Meiosis lesson Meiosis lesson Presentation Transcript

    • Producing Haploid Daughter cells MEIOSIS
    • OBJECTIVES 1. Define Meiosis. 2. Enumerate the stages of Meiosis. 3. Give the significance of Meiosis in Sexual Reproduction.
    • Meiosis - Consists of two successive divisions of the nucleus called meiosis I and meiosis II - Results in four haploid daughter cells - Only happens in the sex gonads ( testes and ovary)
    • Stages of Meiosis First Meiotic Division • Prophase I • Metaphase I • Anaphase I • Telophase I Second Meiotic Division • Prophase II • Metaphase II • Anaphase II • Telophase II
    • Events for First Meiotic Division • Prophase I- chromosome becomes visible and the nuclear membrane disappears; homologous chromosome appears and share fragments called crossing over
    • Metaphase I- complete disappearance of nuclear membrane and appearance of spindle fiber; centromeres attached to the spindle fiber and lies on the metaphase plate or central plate
    • Anaphase I- homologous chromosome separates from each other but centromere do not divide; chromosome continues to consists of two chromatids
    • Telophase I- chromosomes are still doubled; nuclear membrane is formed and disappearance of spindle fiber
    • Second Meiotic Division Prophase II- cells have one chromosome
    • Metaphase II- chromosomes align at the metaphase plate; centromeres divide thus separating the chromatids
    • Anaphase II- each new daughter cell move towards opposite poles
    • Telophase II- spindle disappears; nuclear membrane is formed; nuclei are formed and cytokinesis happens
    • Gametogenesis - a process of producing sex cells • Spermatogenesis- sperm production; occurs during puberty stage and continues throughout life • Oogenesis- production of female gametes or ova
    • Oogenesis
    • Seatwork Answer Activity Sheet on “ Inferring Difference” E:Seatwork #3 in meiosis.docx
    • Assignment #4 • Answer activity sheet on Sexual reproduction in lower forms of life and animals