Single step large mutation is called

Options

A. speciation
B. saltation
C. genetic drift
D. Sewall Wright effect

Answer

To solve the question "Single step large mutation is called," we can follow these steps:

### Step 1: Understand the Types of Mutations
We need to recognize the different types of mutations mentioned in the options:
1. Speciation
2. Saltation
3. Genetic Drift
4. Siebel-Wright Effect

### Step 2: Define Each Term
- **Speciation**: This is the process by which new species arise. It usually occurs over long periods and involves gradual changes.
- **Saltation**: This refers to a significant change or mutation that occurs suddenly and can lead to the formation of new species. It is characterized by large, single-step mutations.
- **Genetic Drift**: This is a mechanism of evolution that refers to random changes in the frequency of alleles in a population.
- **Siebel-Wright Effect**: This is a concept related to genetic drift in small populations, where random events can lead to significant changes in gene frequencies.

### Step 3: Identify the Correct Answer
Given the definitions, we can see that the term that best describes a "single-step large mutation" is **Saltation**. This aligns with the idea that such mutations can lead to significant changes in an organism, potentially resulting in the emergence of new species.

### Step 4: Conclusion
The correct answer to the question is **Saltation**.

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