Extra nuclear genes are present in

Options

A. Cytoplasm
B. E.R and cytoplasm
C. Ribosome and cytoplasm
D. Mitochondrial and cytoplasmic particles

Answer

### Step-by-Step Solution:

1. **Understanding Extra Nuclear Genes**:
Extra nuclear genes refer to genetic material that is located outside the nucleus of a cell. This includes genes found in organelles such as mitochondria and chloroplasts.

2. **Identifying the Concept of Cytoplasmic Inheritance**:
Cytoplasmic inheritance, also known as extra nuclear inheritance, is the transmission of genes that occur outside the nucleus. This type of inheritance is typically associated with organelles that have their own DNA.

3. **Recognizing Where Extra Nuclear Genes Are Found**:
Extra nuclear genes are primarily found in:
- Mitochondria
- Chloroplasts
These organelles contain their own DNA, which is inherited independently of nuclear DNA.

4. **Evaluating the Given Options**:
- **Option 1**: Cytoplasm - Incorrect, as it does not specify organelles with extra nuclear genes.
- **Option 2**: ER and cytoplasm - Incorrect, as the endoplasmic reticulum (ER) does not contain extra nuclear genes.
- **Option 3**: Ribosome and cytoplasm - Incorrect, as ribosomes do not have extra nuclear genes.
- **Option 4**: Mitochondria and cytoplasmic particles - Correct, as mitochondria contain their own DNA and are a primary site for extra nuclear genes.

5. **Conclusion**:
The correct answer is that extra nuclear genes are present in **mitochondria and cytoplasmic particles**.