Which of the following is incorrect about Lamarckism ?

Options

A. Absence of all of the four limbs amongst snakes.
B. Exceptionally long neck of giraffe.
C. An intellectual parents having a dull daughter.
D. Loss of vision in cave - dwelling mammals.

Answer

To determine which statement about Lamarckism is incorrect, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Lamarckism**:
- Lamarckism is a theory of evolution proposed by Jean-Baptiste Lamarck, which suggests that organisms can pass on traits acquired during their lifetime to their offspring. This means that if an organism develops a characteristic due to its environment or behavior, that characteristic can be inherited by its descendants.

2. **Analyzing the Options**:
- **Option 1: Absence of the four limbs among snakes**.
- This statement is correct in the context of Lamarckism. Snakes have evolved to lose their limbs as a result of adaptation to their environment. According to Lamarckism, this trait could be passed down to future generations.

- **Option 2: Exceptionally long neck of giraffe**.
- This is a classic example of Lamarckism. The theory suggests that giraffes developed longer necks because their ancestors stretched their necks to reach higher leaves, and this trait was then inherited by their offspring.

- **Option 3: An intelligent parent having a dull daughter**.
- This statement is incorrect according to Lamarckism. If a parent is intelligent, Lamarckism would suggest that the traits of intelligence would be passed on to the offspring, leading to the expectation that the daughter would also be intelligent.

- **Option 4: Loss of vision in cave-dwelling mammals**.
- This statement aligns with Lamarckism as well. Cave-dwelling mammals have lost their vision over generations due to the lack of light in their environment, and this trait could be inherited by their offspring.

3. **Conclusion**:
- The incorrect statement about Lamarckism is **Option 3: An intelligent parent having a dull daughter**. According to Lamarckism, traits acquired by parents should be passed on to their children, which would imply that the daughter should also be intelligent.

### Final Answer:
The incorrect statement about Lamarckism is **Option 3: An intelligent parent having a dull daughter**.