Genetic variability in rice plants was studied to understand their potential for improvement. Traits related to yield were analyzed in different rice varieties. The researchers found that traits like spikelet fertility, days to maturity, and plant height showed high heritability and genetic advance, indicating they can be easily passed down to future generations and improved upon. The study also revealed that the variability in traits was mostly due to genetic factors rather than environmental influences. This information can help breeders develop better rice varieties with higher yields.