Dominant Expression

Dominant Expression refers to the genetic trait inheritance pattern where one allele visibly manifests in heterozygous (hybrid) offspring, masking the recessive allele. In cannabis breeding, breeders observe dominant traits—such as plant morphology, leaf shape, or terpene profiles—appearing in F1 hybrids even when crossed with recessive-trait parents. This pattern follows Mendelian inheritance principles and is foundational to predictable breeding outcomes. Understanding dominance hierarchies helps breeders stabilize desired characteristics across generations and anticipate phenotypic ratios in segregating populations. Dominant traits are often more readily selected and fixed in breeding programs compared to recessive traits, which require homozygous expression.

Breeders leverage dominant expression to rapidly establish stable line characteristics and predict F1 hybrid performance. Identifying and crossing for dominant traits accelerates selection cycles, particularly when targeting consistent plant structure, yield markers, or terpene prominence across large breeding populations.