Meiosis lesson
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Transcript of Meiosis lesson
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REVIEW
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GIVE THE STAGES OF EACH ILLUSTRATION
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Producing Haploid
Daughter cells
MEIOSIS
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OBJECTIVES
1. Define Meiosis.
2. Enumerate the stages of Meiosis.
3. Give the significance of Meiosis in
Sexual Reproduction.
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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)
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Stages of MeiosisFirst Meiotic Division• Prophase I• Metaphase I• Anaphase I• Telophase ISecond Meiotic Division• Prophase II• Metaphase II• Anaphase II• Telophase II
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Events for First Meiotic Division
• Prophase I- chromosome becomes visible and the nuclear membrane disappears; homologous chromosome appears and share fragments called crossing over
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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
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Anaphase I- homologous chromosome separates from each other but centromere do not divide; chromosome continues to consists of two chromatids
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Telophase I- chromosomes are still doubled; nuclear membrane is formed and disappearance of spindle fiber
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Second Meiotic Division
Prophase II- cells have one chromosome
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Metaphase II- chromosomes align at the metaphase plate; centromeres divide thus separating the chromatids
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Anaphase II- each new daughter cell move towards opposite poles
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Telophase II- spindle disappears; nuclear membrane is formed; nuclei are formed and cytokinesis happens
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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
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Oogenesis
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SeatworkAnswer Activity Sheet on “ Inferring Difference”
E:\Seatwork #3 in meiosis.docx
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Assignment #4• Answer activity sheet on Sexual reproduction in lower forms of life and animals
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