In human female, second polar body is formed in the ovum

Options

A. within ovary
B. within oviducts
C. within uterine cavity
D. within uterine endometrium

Answer

To solve the question regarding when the second polar body is formed in the ovum of a human female, we can break it down into the following steps:

### Step 1: Understand Oogenesis
Oogenesis is the process of egg (ovum) formation in females. It involves several stages of meiosis, which is a type of cell division that reduces the chromosome number by half.

### Step 2: Primary Oocyte Formation
In females, the primary oocyte is formed during fetal development and is arrested in prophase I of meiosis until puberty. At this stage, no polar bodies are produced yet.

### Step 3: Secondary Oocyte Formation
At puberty, during the menstrual cycle, the primary oocyte resumes meiosis and completes the first meiotic division. This division results in two cells: a secondary oocyte and the first polar body. The first polar body is usually smaller and may not be functional.

### Step 4: Completion of Meiosis II
The secondary oocyte is arrested in metaphase II of meiosis and will only complete this division if fertilization occurs. Upon fertilization, the secondary oocyte completes meiosis II, resulting in the formation of the second polar body and a mature ovum.

### Step 5: Location of Polar Body Formation
The second polar body is produced in the fallopian tube (oviduct) at the time of fertilization. Therefore, the correct answer to the question is that the second polar body is formed in the oviduct.

### Final Answer
The second polar body is formed in the ovum during fertilization, specifically in the fallopian tube.

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