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After crossing between two plants, the progenies are found to be male-sterile. This phenomenon is found to be maternally inherited and is due to some genes which are present in

1. nucleus
2. chloroplast
3. mitochondrion
4. cytoplasm

Correct answer: mitochondrion

Solution

Cytoplasmic male sterility is commonly caused by mutations in mitochondrial genes, and mitochondria are typically inherited maternally in plants. That is why the trait appears in progeny from the mother line rather than through nuclear inheritance.

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