After crossing two plants, the progenies are found to be male sterile. The phrnomenon is found to be maternally inherited and is due to some genes which reside in

Options

A. Mitochondria
B. Cytoplasm
C. Nucleus
D. Chloroplast

Answer

To solve the question regarding the inheritance of male sterility in progeny after crossing two plants, we can follow these steps:

### Step 1: Understand the Phenomenon
The question states that the progenies are male sterile. Male sterility in plants can occur due to various genetic factors.

**Hint:** Consider what factors can lead to male sterility in plants.

### Step 2: Identify the Mode of Inheritance
The question specifies that the male sterility is maternally inherited. This means that the genes responsible for this trait are passed from the mother plant to the progeny.

**Hint:** Think about how traits can be passed from one generation to another and the significance of maternal inheritance.

### Step 3: Determine the Location of the Genes
The question asks where the genes responsible for male sterility reside. The options provided are mitochondria, cytoplasm, nucleus, and chloroplast.

**Hint:** Recall the concept of extra-nuclear inheritance and where maternal genes are typically found.

### Step 4: Analyze the Options
1. **Mitochondria**: While mitochondria contain genes, they are not typically associated with maternal inheritance of male sterility.
2. **Cytoplasm**: This is where maternal inheritance occurs, as it contains cytoplasmic genes that can affect traits like male sterility.
3. **Nucleus**: Nuclear genes follow Mendelian inheritance patterns and are not typically responsible for maternal inheritance.
4. **Chloroplast**: Similar to mitochondria, chloroplasts also contain genes but are not primarily associated with male sterility.

**Hint:** Focus on the definition of maternal inheritance and where such genes are usually located.

### Step 5: Conclusion
Based on the analysis, the correct answer is that the genes responsible for male sterility reside in the **cytoplasm**.

**Final Answer:** The genes responsible for male sterility in the progeny reside in the cytoplasm.