Closest relative of modern day man is

Options

A. Prosimians
B. Orang-Utan
C. Monkey
D. Chimpanzee.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the closest relative of modern-day humans. This requires knowledge of evolutionary biology and the relationships among different primate species.

2. **Identifying the Options**: The options provided are:
- A) Prosimians
- B) Orangutan
- C) Monkey
- D) Chimpanzee

3. **Analyzing Each Option**:
- **Prosimians**: This group includes lemurs and tarsiers. They are considered more primitive and are not closely related to humans.
- **Orangutan**: While orangutans are great apes and share a common ancestor with humans, they are not the closest relatives.
- **Monkey**: Monkeys are a diverse group of primates but are not as closely related to humans as great apes.
- **Chimpanzee**: Chimpanzees share a significant amount of genetic material with humans, making them the closest living relatives.

4. **Genetic Evidence**: Studies show that humans and chimpanzees share approximately 98-99% of their DNA. This genetic similarity indicates a close evolutionary relationship.

5. **Chromosome Comparison**: Humans have 46 chromosomes, while chimpanzees have 48. The structure and staining patterns of these chromosomes also reveal similarities that support the close relationship.

6. **Conclusion**: Based on genetic and chromosomal evidence, the closest relative of modern-day humans is the chimpanzee.

**Final Answer**: D) Chimpanzee

---