Where does fertilisation normally take place in a human female?

Explanation

**Step-by-Step Solution:**

1. **Understanding Fertilization**: Fertilization is the biological process where a male sperm cell unites with a female egg cell (ovum) to form a diploid zygote. This is the initial step in the development of a new organism.

2. **Location of Fertilization**: In human females, fertilization typically occurs in the reproductive system. The primary site for this process is the fallopian tube, which connects the ovaries to the uterus.

3. **Specific Site in the Fallopian Tube**: Within the fallopian tube, fertilization does not occur randomly. It specifically takes place at a particular location known as the ampullary-isthmic junction. This is the region where the ampulla (the wider part of the fallopian tube) meets the isthmus (the narrower part).

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