Researchers studied two rice hybrids to understand how genes affect grain yield and its components. They found that the traits were not simply controlled by additive or dominant genes, suggesting the presence of interactions between genes. One hybrid showed positive gene effects for grain yield, while the other had negative effects. The weight of 1000 grains had opposite gene effects in the two hybrids. They also found strong correlations between grain yield and traits like branches per panicle and panicle length. These findings provide insights into the genetic factors influencing rice yield, which could help in breeding programs to develop high-yielding rice varieties.