Which of the following statement is incorrect about oogenesis?

Options

A. The Graafian follicle ruptures to release the secondary oocyte from the ovary by the process called ovulation.
B. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each fetal ovary.
C. The primary oocyte undergoes a second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body.
D. The secondary follicle transforms into tertiary follicle which is characterized by a fluid-filled cavity called the antrum.

Answer

To determine which statement about oogenesis is incorrect, let's analyze each option step by step.

### Step 1: Analyze the First Statement
**Statement:** The Graafian follicle ruptures to release the secondary oocyte from the ovary by the process called ovulation.

**Analysis:** This statement is correct. The Graafian follicle is indeed a mature follicle that releases the secondary oocyte during ovulation.

### Step 2: Analyze the Second Statement
**Statement:** Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells known as oogonia are formed within each fetal ovary.

**Analysis:** This statement is also correct. Oogenesis begins during embryonic development, and oogonia are formed in the fetal ovaries.

### Step 3: Analyze the Third Statement
**Statement:** The primary oocyte undergoes a second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body.

**Analysis:** This statement is incorrect. The primary oocyte undergoes the first meiotic division (meiosis I) to produce a secondary oocyte and a polar body. The secondary oocyte then undergoes the second meiotic division (meiosis II) to form the ovum and another polar body. The phrasing of this statement suggests that the second meiotic division is being confused with the first, making it the incorrect statement.

### Step 4: Analyze the Fourth Statement
**Statement:** The secondary follicle transforms into a tertiary follicle which is characterized by a fluid-filled cavity called the antrum.

**Analysis:** This statement is correct. The secondary follicle does develop into a tertiary follicle (or Graafian follicle), which contains an antrum filled with fluid.

### Conclusion
After analyzing all the statements, the incorrect statement about oogenesis is the third one: "The primary oocyte undergoes a second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body."

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