Dominant Trait Expression

Dominant trait expression refers to the inheritance pattern where a single allele produces an observable phenotype in both homozygous and heterozygous genotypes. In cannabis breeding, dominant traits—such as leaf morphology, growth architecture, or terpene profiles—frequently manifest in the F1 generation when crossing two parent plants. Breeders working in this category track these visible or measurable characteristics across generations to understand heritability and stabilize desirable genetics. Understanding dominance hierarchies helps predictably guide selective breeding programs toward consistent cultivar development. This concept contrasts with recessive trait expression, where two copies of an allele are typically required for phenotypic visibility.

Breeders prioritize identifying dominant markers because they appear reliably in first-generation hybrids, enabling rapid phenotype assessment without waiting for recessive trait segregation in later generations. Mapping dominant traits across lineages accelerates cultivar stabilization and helps predict offspring characteristics in commercial crossing programs.