Coupling and repulsion theory of linkage was given by

Options

A. (a) Morgan
B. (b) Bateson
C. (c) Muiler
D. (d) De vries

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the scientist who proposed the coupling and repulsion theory of linkage in genetics.

2. **Defining Key Terms**:
- **Linkage** refers to the tendency of genes located close to each other on a chromosome to be inherited together.
- **Coupling Phase**: This occurs when two dominant alleles or two recessive alleles are linked together on the same chromosome (cis arrangement).
- **Repulsion Phase**: This occurs when one dominant and one recessive allele are linked together on the same chromosome (trans arrangement).

3. **Identifying the Scientist**:
- The coupling and repulsion theory of linkage was proposed by the scientist **William Bateson**.
- Other scientists mentioned, such as Morgan, Muller, and Kupo-Degres, contributed to genetics but did not propose this specific theory.

4. **Conclusion**: The correct answer to the question is **Bateson**.