Oogenesis

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  • Created by: Lotto65
  • Created on: 16-10-17 19:29
Which cells divide by mitosis to form diploid cells?
Germinal epithelium cells/ primordial germ cells
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What are the cells called after cell growth?
Primary oocytes
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At which phase of meiosis do the oocytes stop developing?
Prophase 1
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What makes up a primary follicle at this point?
A primary oocyte surrounded by a single layer of follicle cells
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How many primary follicles do the ovaries contain in a new born baby?
400,000
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How many primary follicles develop in each menstrual cycle?
A few
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What does the primary oocyte then do?
Completes first division of meiosis
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What is formed in the first meiosis division?
A polar body and a large secondary oocyte
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What happens to the secondary oocyte in meiosis?
Stops in prophase 2. The follicle cells proliferate (grow) and follicular fluid forms
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What is the egg that is released at ovulation?
A secondary oocyte
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When does the second meiosis division take place?
After fertilisation
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What is formed after the second meiosis division?
Ovum and a second polar body
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What happens to the polar bodies?
Do not develop and eventually degenerate
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What does the cytoplasm contain in an egg cell?
Droplets of fat and other nutrients needed during early stages of embryo development
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What do the cortical granules do?
Harden the zona pellucida by changing proteins to prevent multiple fertilisation; removes sperm binding glycoproteins on the surface
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What does the zona pellucida do?
Protects the egg cell and restricts sperm entry with its glycoprotein sperm binding sites
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What is another name for the layer of follicle cells?
Corona radiata
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What are the differences between spermatogenesis and oogenesis?
Millions of sperm produced each day by men and can be released frequently by ***********. Women produce one egg every 28 days if not pregnant; sperm have very little cytoplasm but eggs have more than any other cell. Zygote mitochondria from egg
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What do polar bodies do?
Remove excess genetic material during oogenesis
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What does the germinal epithelium do?
Undergoes mitosis to initiate oogenesis
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What does the mature follicle do?
Secretes estrogen
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What does the empty follicle develop into?
Corpus luteum
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What does the corpus luteum do?
Secretes progesterone
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What does the blood supply in the ovary do?
Transports hormones and nutrients to and from the ovary
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Other cards in this set

Card 2

Front

What are the cells called after cell growth?

Back

Primary oocytes

Card 3

Front

At which phase of meiosis do the oocytes stop developing?

Back

Preview of the front of card 3

Card 4

Front

What makes up a primary follicle at this point?

Back

Preview of the front of card 4

Card 5

Front

How many primary follicles do the ovaries contain in a new born baby?

Back

Preview of the front of card 5
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