Mendelian Genetics

Mendelian genetics describes the inheritance patterns of traits in cannabis that follow predictable ratios across generations, based on dominant and recessive alleles at single loci. Named after Gregor Mendel's foundational work with pea plants, these principles apply to visible cannabis traits—leaf morphology, flowering time, and pigmentation—when controlled by single genes or gene pairs. Breeders working in structured selection programs use Mendelian ratios (3:1, 9:3:3:1) to predict offspring phenotypes and stabilize desired characteristics. Most cannabis traits are polygenic (controlled by multiple genes), complicating simple Mendelian predictions, but understanding these fundamentals remains essential for directed breeding. Some cannabinoid and terpene pathways show partial Mendelian inheritance patterns, though environmental factors and epigenetics also influence expression. This fr

Breeders use Mendelian principles to design crosses with predictable outcomes, test for hidden recessive traits through backcrossing, and document trait segregation across F1, F2, and inbred lines. Understanding dominance relationships helps stabilize line integrity and identify which traits breed true versus those requiring continued selection.