Producing Haploid
Daughter cells
MEIOSIS
OBJECTIVES
1. Define Meiosis.
2. Enumerate the stages of
Meiosis.
3. Give the significance of
Meiosis in Sexual Reproducti...
Meiosis
- Consists of two successive
divisions of the nucleus
called meiosis I and
meiosis II
- Results in four haploid
da...
Stages of Meiosis
First Meiotic Division
• Prophase I
• Metaphase I
• Anaphase I
• Telophase I
Second Meiotic Division
• P...
Events for First Meiotic
Division
• Prophase I- chromosome becomes visible
and the nuclear membrane disappears;
homologous...
Metaphase I- complete
disappearance of nuclear membrane
and appearance of spindle fiber;
centromeres attached to the spind...
Anaphase I- homologous
chromosome separates from each
other but centromere do not divide;
chromosome continues to consists...
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
cont...
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
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
Meiosis lesson
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Meiosis lesson

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Meiosis lesson

  1. 1. Producing Haploid Daughter cells MEIOSIS
  2. 2. OBJECTIVES 1. Define Meiosis. 2. Enumerate the stages of Meiosis. 3. Give the significance of Meiosis in Sexual Reproduction.
  3. 3. 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)
  4. 4. 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
  5. 5. Events for First Meiotic Division • Prophase I- chromosome becomes visible and the nuclear membrane disappears; homologous chromosome appears and share fragments called crossing over
  6. 6. 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
  7. 7. Anaphase I- homologous chromosome separates from each other but centromere do not divide; chromosome continues to consists of two chromatids
  8. 8. Telophase I- chromosomes are still doubled; nuclear membrane is formed and disappearance of spindle fiber
  9. 9. Second Meiotic Division Prophase II- cells have one chromosome
  10. 10. Metaphase II- chromosomes align at the metaphase plate; centromeres divide thus separating the chromatids
  11. 11. Anaphase II- each new daughter cell move towards opposite poles
  12. 12. Telophase II- spindle disappears; nuclear membrane is formed; nuclei are formed and cytokinesis happens
  13. 13. 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
  14. 14. Oogenesis
  15. 15. Seatwork Answer Activity Sheet on “ Inferring Difference” E:Seatwork #3 in meiosis.docx
  16. 16. Assignment #4 • Answer activity sheet on Sexual reproduction in lower forms of life and animals
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