- A A nuclear recessive mutation that is inherited generally according to standard Mendelian segregation ratios across generations
- B Sterility caused by mitochondrial genes that prevent pollen development (used in hybrid seed production in rice, maize, sorghum)
- C A condition that is caused specifically by deletion of particular genes located on the X chromosome itself
- D A condition induced largely by a persistent, latent viral infection that specifically targets the developing anther tissue
Correct answer: B. Sterility caused by mitochondrial genes that prevent pollen development (used in hybrid seed production in rice, maize, sorghum)
Explanation: CMS: mitochondrial gene (non-Mendelian) causes pollen abortion. Nuclear restorer genes (Rf) can restore fertility. Used in F1 hybrid seed production: CMS female x normal male -- no manual emasculation needed.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development — the highest-scoring Class 12 biology chapter in NEET.
Read the full Sexual Reproduction in Flowering Plants notes →