Practice question

Cytoplasmic-genic male sterility arises from antagonistic interaction between mitochondrial genome carrying sterility causing chimeric open reading frames and nuclear genome harboring restorer of fertility Rf genes. Mitochondrial ORFs such as orf79 in rice WA cytoplasm, orf138 in Brassica Ogu cytoplasm resulting from rearrangement generate cytotoxic peptides disrupting mitochondrial electron transport complex assembly reducing ATP supply critical for high energy demand of tapetal cells during microsporogenesis. Cytoplasm S with ORF confers sterility when nuclear background homozygous for non-restorer alleles rfrf lacking ability to process aberrant transcripts. Dominant Rf genes encode pentatricopeptide repeat proteins that cleave, edit or block translation of sterility transcripts restoring respiration. Interaction explains maternal inheritance of sterility and Mendelian restoration in F1, foundation for three-line hybrid breeding using A, B and R lines. This understanding supports competitive exam preparation for NEET, GATE and CSIR NET concepts linking genotype with phenotype through molecular pathways involving transcription factors, hormones and metabolic enzymes that regulate development, adaptation and reproductive biology in applied breeding programs.