The study looked at the genetic effects and heterosis of boll weight and lint percentage in transgenic cotton plants. They used seven high-yield cultivars with resistance to bollworm and five high-quality fiber accessions to create 35 crosses. Results showed that boll weight is mainly influenced by dominant genes, while lint percentage is more affected by additive genes. Positive heterosis was found for boll weight, suggesting hybrid breeding could be beneficial. Lint percentage, on the other hand, should be selected for in early generations due to its high heritability.