1. Pre – AP Biology
Process of Meiosis (5.4)

2. Somatic vs. Germ

3. Female XX Karyotype (Remember… “kary” means “nucleus”)

4. Male XY Karyotype

5. Germ cells

6. TWO Divisions of Meiosis

7. Meiosis I -First Division

8. Meiosis II - Second Division

9. Spermatogenesis Spermatogonium Mitotic division, producing
large numbers of spermatogonia
Sertoli cell
nucleus
Differentiation and onset of meiosis I
Primary spermatocyte
(in prophase of meiosis I)
Meiosis I completed
Secondary spermatocyte
Meiosis II
Lumen of
Seminiferous tubule
Early
spermatids
Spermatids
(at two stages of
differentiation)
Differentiation
Sperm cells
Neck
Head
Midpiece
Tail
Plasma membrane
Acrosome
Nucleus
Mitochondria

10. Oogenesis in the ovaries
Ovary
Primary germ cell
in embryo
Differentiation
Oogonium
Mitotic
division
Primary
oocyte
Completion of meiosis I
and onset of meiosis II
Secondary
oocyte
First polar body
Ovulation
Entry of sperm
triggers
completion
of meiosis II
Second polar body
Ovum

11. Variation is the outcome desired

12. Mitosis vs. Meiosis