Oogenesis Flashcards

Questions and Answers

What is produced in the process of oogenesis?

Ova or eggs

Where does oogenesis take place?

Ovaries

What type of cell division do oogonia undergo and what is produced?

Mitosis and primary oocytes

What type of cell division do the primary oocytes undergo?

Meiosis but the process stops at prophase 1 Signup and view all the answers

What does the germinal epithelium divide to form?

Follicle cells to surround the primary oocytes to form primary follicles Signup and view all the answers

When do the primary oocytes mature?

Just before ovulation Signup and view all the answers

At puberty, what stimulates the follicles to develop further?

Oestrogen Signup and view all the answers

How many follicles develop and fully mature?

Several follicles develop but only one fully develops Signup and view all the answers

What does the fully developed follicle develop into?

A Graafian follicle Signup and view all the answers

What cell division does the primary oocyte undergo and what is produced?

First meiotic division to form the haploid secondary oocyte and a small polar body Signup and view all the answers

Where does the Graafian follicle migrate to and when it has migrated, what happens?

To the surface of the ovary, where it bursts and the secondary oocyte is released Signup and view all the answers

What is the name of the process in which the Graafian follicle rises to the surface, bursts, and releases the secondary oocyte?

Ovulation Signup and view all the answers

What division does the secondary oocyte now undergo?

Second meiotic division, stops at metaphase unless fertilisation takes place Signup and view all the answers

What happens upon fertilisation?

Division is completed to form a large ovum and a second polar body Signup and view all the answers

What occurs after the division has taken place?

Nucleus of the ovum fuses with that of the sperm to form a zygote Signup and view all the answers

What does the zygote eventually develop into?

Embryo Signup and view all the answers

What does the Graafian follicle become following ovulation?

Corpus luteum Signup and view all the answers

What is the role of the corpus luteum?

Produces hormones during pregnancy Signup and view all the answers

What happens to the corpus luteum if fertilisation doesn't take place?

Regresses Signup and view all the answers

Where is human Chorionic Gonadotropin (hCG) produced?

Corpus luteum Signup and view all the answers

Study Notes

Oogenesis Overview

Oogenesis is the process that produces ova (eggs) in female organisms.
It primarily occurs in the ovaries.

Cell Division in Oogenesis

Oogonia undergo mitosis, resulting in the formation of primary oocytes.
Primary oocytes undergo meiosis, but the process halts at prophase 1.

Follicle Development

Germinal epithelium cell divisions yield follicle cells that surround primary oocytes and form primary follicles.
Primary oocytes mature just before ovulation, stimulated by oestrogen at puberty.

Follicle Maturity and Ovulation

Multiple follicles develop, but only one reaches full maturity.
The mature follicle transforms into a Graafian follicle.
The Graafian follicle migrates to the surface of the ovary, eventually bursting to release the secondary oocyte in a process known as ovulation.

Meiotic Divisions

The primary oocyte undergoes the first meiotic division, resulting in a haploid secondary oocyte and a polar body.
Upon ovulation, the secondary oocyte enters the second meiotic division, stopping at metaphase unless fertilization occurs.

Fertilization and Zygote Formation

Upon fertilization, the secondary oocyte completes its division, forming a large ovum and a second polar body.
The nuclei of the ovum and the sperm combine to form a zygote.

Embryonic Development

The zygote ultimately develops into an embryo.

Post-Ovulation Changes

After ovulation, the Graafian follicle transforms into the corpus luteum.
The corpus luteum plays a crucial role in producing hormones necessary for maintaining pregnancy.

Fate of the Corpus Luteum

If fertilization does not occur, the corpus luteum regresses.

hCG Production

Human Chorionic Gonadotropin (hCG) is produced by the corpus luteum, playing an essential role in pregnancy detection.

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Description

Test your knowledge of oogenesis with these flashcards. Learn about the process of egg production, where it occurs, and the types of cell division involved. Perfect for biology students seeking to understand female gametogenesis.