Which of the following is an incorrect statement?

Options

A. Genetic drift can bring about the change in gene frequencies in any direction
B. Bottle neck effect explain evolution of Darwin finches on Galapagos island
C. Gene flow is exchange of gene between two different population of a species
D. Hardy-Weinberg principle stated that sum total of all allelic frequenciea in a large population is 1

Answer

To solve the question of identifying the incorrect statement among the given options, we can follow these steps:

### Step 1: Analyze the First Statement
- **Statement**: Genetic drift can bring about the change in gene frequencies in any direction.
- **Analysis**: This statement is correct. Genetic drift is a random process that can lead to changes in allele frequencies in a population, and it does not have a specific direction.

### Step 2: Analyze the Second Statement
- **Statement**: Bottleneck effect explains evolution of Darwin's finches on Galapagos island.
- **Analysis**: This statement is incorrect. The evolution of Darwin's finches is an example of adaptive radiation, not the bottleneck effect. The bottleneck effect refers to a sharp reduction in the size of a population due to environmental events, which does not apply to the case of Darwin's finches.

### Step 3: Analyze the Third Statement
- **Statement**: Gene flow is the exchange of genes between two different populations of a species.
- **Analysis**: This statement is correct. Gene flow involves the transfer of genetic material between populations, which can affect the genetic diversity of those populations.

### Step 4: Analyze the Fourth Statement
- **Statement**: Hardy-Weinberg principle states that the sum total of all allelic frequencies in a large population is 1.
- **Analysis**: This statement is also correct. According to the Hardy-Weinberg principle, the total frequency of all alleles in a population must equal 1, and it provides a mathematical framework for understanding genetic variation in populations.

### Conclusion
After analyzing all four statements, we find that the second statement regarding the bottleneck effect and Darwin's finches is the incorrect one. Therefore, the answer is:

**Answer**: The incorrect statement is option B.

---