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Spermatogenesis vs. Oogenesis

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Rebecca Poronto

on 30 June 2014

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Transcript of Spermatogenesis vs. Oogenesis

Spermatogenesis vs. Oogenesis

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

Oogenesis

Oogenesis

Oogenesis

Spermatogenesis



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

Spermatogenesis

Gametogenesis

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

References

Biology Textbook
Images:
http://faculty.southwest.tn.edu/rburkett/A&P2_r7.jpg
http://bio1152.nicerweb.com/Locked/media/ch46/46_12Spermatogenesis.jpg
http://bio1151.nicerweb.com/doc/class/bio1152/Locked/media/ch46/46_12Testis.jpg
http://www.northland.cc.mn.us/biology/ap2online/ap2lab/lab10/images/sperm.jpg
http://bohone.wikispaces.com/file/view/ovary.jpg/31077243/ovary.jpg
http://www.mun.ca/biology/desmid/brian/BIOL2060/BIOL2060-20/2009.jpg
http://mac122.icu.ac.jp/biobk/oogenesis.jpg
http://www.colorado.edu/intphys/iphy4480tsai/oogenesis.jpg

Oogenesis

Oogenesis

Oogenesis

Oogenesis: creation of haploid egg cells using meiosis
Occurs in the ovaries of females

Spermatogenesis

Spermatogenesis: The production of sperm using meiosis
Occur in the
seminiferous tubules
in the testes in males

Spermatogenesis

5

4

3

2

1

Germ Cells: Spermatogonia
Diploid

The spermatogonia that goes through meiosis is called a
primary spermatocyte.
Diploid at the beginning!


Primary spermatocyte goes through Meiosis I.
2
secondary spermatocytes
at the end!
Now haploid, but 2 chromatids per chromosome

Secondary spermatocytes go through Meiosis II
Produce 2
spermatids
Spermatids: Haploid, each contain 1 chromosome

Spermatids turn into
spermatozoa


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

During ovulation:
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.
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