Dominant Trait Expression

Dominant trait expression in cannabis refers to the inheritance pattern where one allele masks the effects of a recessive allele in heterozygous plants. In breeding contexts, breeders observe dominant traits—such as leaf morphology, growth structure, or terpene profiles—manifesting consistently across first-generation offspring when crossing homozygous dominant parents with other genotypes. Understanding dominance relationships helps predict phenotypic outcomes across generations and stabilize desired characteristics in cultivar development. This concept differs from incomplete dominance or codominance, where both alleles may contribute equally to the visible phenotype. Lineage records frequently report dominant trait inheritance when establishing true-breeding lines or F1 hybrids with consistent, predictable features.

Breeders leverage dominant trait expression to rapidly fix desired characteristics in new cultivars, particularly when working toward stable F1 hybrids or IBL (inbred line) development. Identifying which traits breed true as dominant allows breeders to make targeted crosses that reliably express target phenotypes in offspring, reducing selection cycles and improving breeding efficiency.