Biogenetic law was propounded by

Options

A. Von Baer and Haeckel
B. Von Bear and Aristotle
C. Haeckel and Mendel
D. Mendel and Griffith

Answer

**Step-by-Step Solution:**

1. **Understanding Biogenetic Law**: The biogenetic law is a concept in evolutionary biology that suggests that the development of an individual organism (ontogeny) follows the same progression as the evolutionary history of that organism's species (phylogeny). This is often summarized by the phrase "ontogeny recapitulates phylogeny."

2. **Identifying Key Terms**:
- **Ontogeny**: The development of an individual organism from fertilization to maturity.
- **Phylogeny**: The evolutionary history and relationships among species.

3. **Historical Context**: The biogenetic law was notably discussed in the 19th century and is primarily associated with two scientists: Karl Ernst von Baer and Ernst Haeckel.

4. **Examining the Scientists**:
- **Karl Ernst von Baer**: He is known for his work in embryology and is credited with the formulation of the biogenetic law.
- **Ernst Haeckel**: He popularized the phrase "ontogeny recapitulates phylogeny" and contributed significantly to the understanding of evolutionary biology.

5. **Eliminating Incorrect Options**:
- **Aristotle**: Known for his classification systems, not for the biogenetic law.
- **Gregor Mendel**: Known for his work in genetics, not related to the biogenetic law.
- **Frederick Griffith**: Associated with the discovery of the transforming principle in genetics.

6. **Conclusion**: Based on the contributions of the scientists mentioned, the biogenetic law was propounded by Karl Ernst von Baer and Ernst Haeckel.

**Final Answer**: The biogenetic law was propounded by Karl Ernst von Baer and Ernst Haeckel.

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