4. Producing Haploid
Daughter cells
MEIOSIS

5. OBJECTIVES
1. Define Meiosis.
2. Enumerate the stages of
Meiosis.
3. Give the significance of
Meiosis in Sexual Reproduction.

6. 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)

7. 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

9. Events for First Meiotic
Division
• Prophase I- chromosome becomes visible
and the nuclear membrane disappears;
homologous chromosome appears and
share fragments called crossing over

10. 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

11. Anaphase I- homologous
chromosome separates from each
other but centromere do not divide;
chromosome continues to consists of
two chromatids

12. Telophase I- chromosomes are
still doubled; nuclear membrane
is formed and disappearance of
spindle fiber

14. Second Meiotic Division
Prophase II- cells have
one chromosome

15. Metaphase II-
chromosomes align at the
metaphase plate;
centromeres divide thus
separating the chromatids

16. Anaphase II- each
new daughter cell
move towards
opposite poles

17. Telophase II- spindle
disappears; nuclear
membrane is formed; nuclei
are formed and cytokinesis
happens

18. 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

23. Oogenesis

24. Seatwork
Answer Activity Sheet
on “ Inferring
Difference”
E:Seatwork #3 in meiosis.docx

25. Assignment #4
• Answer activity sheet
on Sexual
reproduction in lower
forms of life and
animals