A hybrid where the cytoplasm of two parent cells are fused by retaining only one parental nucleus is called

Options

A. Asymmetric somatic hybrid
B. cybrid
C. an interbreed
D. symmetric hybrid

Answer

To answer the question "A hybrid where the cytoplasm of two parent cells are fused by retaining only one parental nucleus is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- We need to identify the key components of the question: "hybrid," "cytoplasm of two parent cells," and "one parental nucleus."

2. **Analyzing the Options**:
- The options provided are:
1. Asymmetric somatic hybrid
2. Cybrid
3. Anther culture
4. Symmetric hybrid

3. **Defining the Terms**:
- **Asymmetric Somatic Hybrid**: Typically involves fusion of two cells where both parental nuclei may be retained.
- **Cybrid**: A hybrid cell that contains cytoplasm from one species and a nucleus from another species.
- **Anther Culture**: A technique used in plant tissue culture, not relevant here.
- **Symmetric Hybrid**: Usually refers to hybrids where both parental nuclei are retained.

4. **Identifying the Correct Definition**:
- The definition of a cybrid indicates that it consists of the cytoplasm from both species but retains only one nucleus from one of the parent cells. This matches the description given in the question.

5. **Conclusion**:
- Based on the definitions and analysis, the correct answer is **option 2: Cybrid**.