Dominant Recessive Alleles

Dominant and recessive alleles are paired gene variants that determine trait expression in cannabis offspring. In diploid organisms like cannabis, each parent contributes one allele per gene; dominant alleles mask recessive ones when present together. Understanding dominance patterns helps breeders predict phenotypic outcomes across generations and stabilize desirable traits in breeding lines. Recessive traits only appear when an individual inherits two recessive alleles (homozygous recessive). Classical Mendelian genetics frameworks applied to cannabis show that morphology, cannabinoid ratios, terpene profiles, and flowering time often follow predictable dominance relationships, though some traits exhibit incomplete or codominance patterns. Tracking allele combinations across pedigrees remains central to systematic strain development.

Breeders leverage dominance knowledge to predict F1 and F2 generation outcomes, accelerate trait fixation in IBL (inbred line) development, and strategically combine complementary genotypes. Understanding whether desirable traits are dominant or recessive directly shapes crossing strategy and selection intensity.