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After crossing two plants, the progenies...

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

A

nucleus

B

chloroplast

C

mitochondria

D

cytoplasm

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**Step-by-Step Solution:** 1. **Understanding the Problem:** The question states that after crossing two plants, the progenies are male sterile. This means that the offspring do not produce functional male gametes (pollen grains). 2. **Identifying the Inheritance Pattern:** The problem specifies that this male sterility is maternally inherited. This suggests that the trait is passed down from the mother plant to the progeny, which is not typical of Mendelian inheritance. 3. **Recognizing the Type of Inheritance:** The phenomenon described is indicative of cytoplasmic inheritance. Unlike Mendelian inheritance, which involves nuclear genes, cytoplasmic inheritance involves genes located in the cytoplasm of the cell. 4. **Locating the Genes Responsible:** In plants, the cytoplasm contains organelles such as mitochondria and chloroplasts, which harbor extra-nuclear DNA. The genes responsible for male sterility in this case are likely located in these organelles. 5. **Conclusion:** Therefore, the answer to the question is that the male sterility observed in the progeny is due to genes that reside in the mitochondria and chloroplasts, indicating a case of cytoplasmic inheritance. **Final Answer:** The phenomenon is due to genes that reside in the mitochondria and chloroplasts, indicating cytoplasmic inheritance. ---
**Step-by-Step Solution:** 1. **Understanding the Problem:** The question states that after crossing two plants, the progenies are male sterile. This means that the offspring do not produce functional male gametes (pollen grains). 2. **Identifying the Inheritance Pattern:** The problem specifies that this male sterility is maternally inherited. This suggests that the trait is passed down from the mother plant to the progeny, which is not typical of Mendelian inheritance. 3. **Recognizing the Type of Inheritance:** The phenomenon described is indicative of cytoplasmic inheritance. Unlike Mendelian inheritance, which involves nuclear genes, cytoplasmic inheritance involves genes located in the cytoplasm of the cell. ...
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