1. Genetics - Meiosis

2. Parent to offspring

3. Mom and Dad’s DNA contribution The egg surrounded by sperm.

4. Genome of a female human

5. Half (n) from father & half(n) from mother

6. Locus (Gene locations on chromosomes)

7. Asexual reproduction See the bud on the side… that is the “new” organism to be.

8. Sexual Reproduction

9. Somatic vs. Germ

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

11. Male XY Karyotype

12. Germ cells

13. TWO Divisions of Meiosis

14. Meiosis I -First Division

15. Meiosis II - Second Division

16. 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

17. 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

18. Variation is the outcome desired

19. Mitosis vs. Meiosis