Introduction:
The process of meiosis in females results in the formation of polar bodies. These polar bodies are small cells that do not have the ability to be fertilized and develop into embryos. In this case, we will calculate the number of polar bodies formed by a female who has attained puberty at the age of 13 and has had three children born by normal delivery.

Explanation:

Puberty:
Puberty is the stage of development when a person becomes capable of sexual reproduction. In females, it is marked by the onset of menstruation. In this case, the female attained puberty at the age of 13 years.

Menstrual Cycle:
The menstrual cycle is a monthly series of changes in the female reproductive system. It lasts approximately 28-30 days and involves the release of an egg from the ovary (ovulation) and the shedding of the uterine lining (menstruation).

Formation of Polar Bodies:
During meiosis, the process of cell division that produces eggs, polar bodies are formed. These polar bodies do not have the ability to be fertilized and develop into embryos. The formation of polar bodies occurs during the first and second meiotic divisions.

Number of Polar Bodies:
In females, each primary oocyte gives rise to one egg and three polar bodies. However, only one of the polar bodies is typically formed during meiosis I, and the remaining two are formed during meiosis II.

Given that the female in question has had three children born by normal delivery, we can assume that she has ovulated and released an egg for each pregnancy. Therefore, she has gone through three menstrual cycles.

Each menstrual cycle lasts approximately 28-30 days, and ovulation occurs around the midpoint of the cycle. Therefore, we can estimate that the female has gone through three ovulation events.

During each ovulation event, one egg is released, and one polar body is formed during meiosis I. Therefore, the female has formed three polar bodies during meiosis I.

Additionally, during meiosis II, two polar bodies are formed for each egg. Since the female has gone through three ovulation events, there would be a total of six polar bodies formed during meiosis II.

Therefore, in total, the female would have formed three polar bodies during meiosis I and six polar bodies during meiosis II. Hence, the number of polar bodies formed in her body till date would be nine.

Conclusion:
In this case, the female who attained puberty at the age of 13 and has had three children born by normal delivery would have formed a total of nine polar bodies in her body till date. Three polar bodies are formed during meiosis I, and six polar bodies are formed during meiosis II.

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