During serological test in which anti-human serum is mixed with blood of another animal, blood of which animal gives the thickest precipitate

Options

A. Gibbon
B. Chimpanzee
C. Dog
D. Mule

Explanation

To solve the question regarding which animal's blood gives the thickest precipitate when mixed with anti-human serum during a serological test, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Serological Testing**:
- Serological tests involve mixing serum (which contains antibodies) with blood from another animal to observe the reaction, specifically the formation of precipitates.

2. **Identify the Role of Anti-Human Serum**:
- Anti-human serum contains antibodies that are specific to human antigens. When mixed with blood from another animal, these antibodies will react with similar antigens present in that animal's blood.

3. **Determine the Importance of Genetic Relatedness**:
- The thickness of the precipitate formed is directly related to how genetically similar the animal's blood is to human blood. The closer the genetic relationship, the more similar the antigens will be, leading to a stronger immune response and a thicker precipitate.

4. **Evaluate the Given Options**:
- The options provided are: Gippon, Sampansi, Dog, and Mule.
- Among these, we need to consider which animal is genetically closest to humans.

5. **Analyze Genetic Similarity**:
- Chimpanzees (often referred to in the context of "Gippon" or "Sampansi") share approximately 99% of their DNA with humans, making them the most closely related.
- Dogs and mules are much less genetically similar to humans compared to chimpanzees.

6. **Conclusion**:
- Since chimpanzees are the closest relatives to humans, the blood of a chimpanzee will give the thickest precipitate when mixed with anti-human serum.

### Final Answer:
The blood of a **chimpanzee** will give the thickest precipitate when mixed with anti-human serum.

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