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Spermatogenesis vs. Oogenesis
Transcript of Spermatogenesis vs. Oogenesis
SUMMARY of OOGENESIS:
Results in three POLAR BODIES and one OVUM (egg) that has extra cytoplasm
Meiosis I occurs during ovulation
Meiosis II occurs after fertilization
Occurs in the ovaries (and fallopian tubes for meiosis II) in females
SUMMARY of SPERMATOGENESIS:
4 haploid spermatozoa (mature sperm) are created
Happens in the testes in the seminiferous tubules
The production of sperm is an ongoing process in the seminiferous tubules
Diploid germ cells go through meiosis to form gametes... the processes are different for boys and girls.
Spermatogenesis in males
Oogenesis in females
What is the name of the special cells that undergo meiosis?
Gametogenesis using Meiosis in Males and Females
Spermatogenesis vs. Oogenesis
Oogenesis: creation of haploid egg cells using meiosis
Occurs in the ovaries of females
Spermatogenesis: The production of sperm using meiosis
Occur in the
in the testes in males
Germ Cells: Spermatogonia
The spermatogonia that goes through meiosis is called a
Diploid at the beginning!
Primary spermatocyte goes through Meiosis I.
at the end!
Now haploid, but 2 chromatids per chromosome
Secondary spermatocytes go through Meiosis II
Spermatids: Haploid, each contain 1 chromosome
Spermatids turn into
Spermatozoa = Sperm
Ready to fertilize egg!
Germ Cells: These are the diploid cells that go through meiosis to form gametes (sex cells)
Germ Cells = Oogonia
Primary oocytes come from: Oogonia
Oogonia come from: Follicles in the ovaries
A female has all of her primary oocytes when she is born! They stay like this until ovulation.
Diploid primary oocytes are paused at Prophase I
Undergoes Meiosis I
2 different structures:
1 HAPLOID secondary oocyte. Has sister chromatids.
1 HAPLOID polar body
Does not become an egg
UNEQUAL CYTOKINESIS occurs. Secondary oocyte gets most of the cytoplasm.
AFTER Meiosis I, the secondary oocyte stays in Metaphase II UNTIL FERTILIZATION
Once fertilization occurs, the secondary oocyte undergoes Meiosis II and the result again is two separate structures:
ONE haploid ovum (egg)
ONE polar body!
The other polar body from the previous step contained chromatids, so it also undergoes Meiosis II and produces TWO polar bodies.