Chromosomal theory of inheritance was given by

Options

A. Morgan et al
B. Sutton and Boveri
C. Hugo de Vries
D. Gregor J. Mendel

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the originator of the chromosomal theory of inheritance. This theory explains how chromosomes carry genetic information and how they are passed from parents to offspring.

2. **Identifying the Options**: The options provided are:
- A) Morgan et al.
- B) Citroën and Bovary
- C) Rick Gervais
- D) Ricard John Mandel

3. **Analyzing Each Option**:
- **Morgan et al.**: Known for their work on linkage and recombination in genetics, but not specifically for the chromosomal theory of inheritance.
- **Citroën and Bovary**: This pair is associated with the chromosomal theory of inheritance.
- **Rick Gervais**: Not a recognized figure in genetics related to inheritance.
- **Ricard John Mandel**: While Mendel is known for his laws of inheritance, he did not formulate the chromosomal theory.

4. **Conclusion**: Based on the analysis, the correct answer is **B) Citroën and Bovary**, as they are credited with the chromosomal theory of inheritance.

5. **Final Answer**: The chromosomal theory of inheritance was given by Citroën and Bovary.

---