The mitotic division starts as the zygote moves ______ of the oviduct called cleavage towards the uterus.

Options

A. Ampulla
B. Isthmus
C. Fimbriae
D. Infundibulum

Answer

**Step-by-Step Solution:**

1. **Understanding the Context**: The question pertains to the movement of the zygote after fertilization and during its journey towards the uterus.

2. **Identifying the Location**: The zygote is formed in the oviduct, specifically at the ampulla-isthmic junction, where fertilization occurs.

3. **Movement of the Zygote**: After fertilization, the zygote begins to undergo mitotic divisions as it travels through the oviduct towards the uterus.

4. **Identifying the Correct Part of the Oviduct**: The oviduct consists of several parts: fimbria, infundibulum, ampulla, isthmus, and finally, it connects to the uterus. The zygote moves through these sections.

5. **Determining the Correct Answer**: The zygote undergoes cleavage (mitotic division) while it is in the isthmus region of the oviduct before it reaches the uterus for implantation.

6. **Final Answer**: The mitotic division starts as the zygote moves **through the isthmus** of the oviduct called cleavage towards the uterus.

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