True statement regarding oogenesis is/are :
**Core Concept**
Oogenesis is the complex process of female gamete (egg cell or ovum) formation, involving meiosis and cell differentiation. It begins with the proliferation of primordial germ cells in the ovaries, which eventually give rise to primary oocytes. The primary oocyte undergoes meiosis I to form a secondary oocyte and a first polar body, and then meiosis II to form a mature ovum and a second polar body.
**Why the Correct Answer is Right**
The correct answer involves the process of oogenesis. Meiosis I in oogenesis results in the formation of a secondary oocyte and a first polar body, which is a key characteristic of this process. The secondary oocyte then undergoes meiosis II, but it arrests at metaphase II until fertilization. The mature ovum and second polar body are formed after fertilization. This process is crucial for the reproduction of females.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe a true statement regarding oogenesis. The process of oogenesis involves meiosis and cell differentiation, but it does not involve the formation of sperm cells.
**Option B:** This option is incorrect as it does not describe the correct process of oogenesis. Meiosis I in oogenesis results in the formation of a secondary oocyte and a first polar body, not two equal daughter cells.
**Option C:** This option is incorrect as it does not accurately describe the process of oogenesis. The secondary oocyte does not undergo meiosis II to form two equal daughter cells; it arrests at metaphase II until fertilization.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the secondary oocyte undergoes meiosis II only after fertilization, resulting in the formation of a mature ovum and a second polar body. Failure of fertilization leads to the degeneration of the secondary oocyte.
**Correct Answer:** None provided