Question

Explain the step in the formation of an ovum from an oogoniun in humans ​

Answer 1

Answer:

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• Oogenesis is initiated in embryonic ovaries of the female fetus.
• The cell starts division (oogonia) and enter into prophase 1 of the meiotic cycle and get temporarily arrested at that stage, called primary oocyte.
• Each primary oocyte gets surrounded by a layer of granulosa cell and then called primary follicle.

Explanation:

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Answer 2

Explanation:

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Oogenesis is initiated in embryonic ovaries of the female fetus.

The cell starts division (oogonia) and enter into prophase 1 of the meiotic cycle and get temporarily arrested at that stage, called primary oocyte.

Each primary oocyte gets surrounded by a layer of granulosa cell and then called primary follicle. Many of these degenerate, hence by puberty only 60000 - 80000 primary follicle remain.

Further, it gets surrounded by more layers of granulosa and a new theca and form secondary follicle.

Soon these transform into the tertiary follicle, characterized by the presence of fluid-filled cavity called Antrum. At this stage, the primary oocyte grows and completes it's first meiotic division.

The division is unequal and leads to the formation of a large secondary oocyte and a tiny polar body.

The tertiary follicle further mature into Graafian follicle, the secondary oocyte forms a new layer called Zona pellucida surrounding itself.

During ovulation, this follicle ruptures to release secondary oocyte/ovum (which completes 2nd meiotic division just prior to fertilization)