Give Weismann's theory of germplasm. What light does it throw on Lamarckism ?

Options

A. Mutation theory
B. Darwin's theory of natural selection
C. Darwin's theory of Pangenesis
D. Neo-Darwinism

Answer

### Step-by-Step Solution:

1. **Introduction to Weismann's Theory**:
- Weismann proposed the theory of germplasm in the late 19th century. This theory emphasizes that inheritance occurs exclusively through germ cells (sperm and eggs) and not through somatic (body) cells.

2. **Definition of Germplasm**:
- Germplasm refers to the genetic material that is passed from one generation to the next. According to Weismann, only the germ cells carry the genetic information necessary for the development of offspring.

3. **Rejection of Lamarckism**:
- Lamarck's theory suggested that acquired characteristics (traits developed during an organism's lifetime due to environmental influences) could be inherited by the next generation. Weismann rejected this idea, asserting that only genetic traits present in germ cells could be inherited.

4. **Key Distinction**:
- The main distinction made by Weismann is between somatic and germinal traits. Somatic traits are those that are acquired during an organism's life and are not passed on to offspring, while germinal traits are inherited.

5. **Conclusion**:
- Weismann's theory of germplasm fundamentally opposes Lamarckism by asserting that acquired characteristics cannot be inherited. This theory laid the groundwork for modern genetics and the understanding of heredity.