Single step large Mutation is named as ……… X ……… by ………..Y …………… .
Find out the correct option for X and Y

Options

A. `{:(X,Y),("Speciation","Hugo deVreies"):}`
B. `{:(X,Y),("Saltation","Charles Darwin"):}`
C. `{:(X,Y),("Mutation","Charles Darwin"):}`
D. `{:(X,Y),("Saltation","Hugo deVries"):}`

Answer

To solve the question, we need to identify the terms represented by X and Y in the statement "Single step large Mutation is named as ……… X ……… by ………..Y …………… ."

### Step-by-Step Solution:

1. **Understanding the Terms**:
- We need to define what a "single step large mutation" refers to in biological terms. This concept is often associated with significant changes in an organism's genetic makeup that can lead to the formation of new species.

2. **Identifying X**:
- The term that describes a "single step large mutation" is known as "Saltation." This term refers to the idea that evolution can occur in large jumps rather than through gradual changes.

3. **Identifying Y**:
- The scientist associated with the concept of saltation is Hugo de Vries. He proposed that mutations are a key mechanism in the process of evolution, particularly in the formation of new species.

4. **Finalizing the Answer**:
- Therefore, we can fill in the blanks: "Single step large Mutation is named as Saltation by Hugo de Vries."

### Answer:
X = Saltation
Y = Hugo de Vries