Meiotic Irregularity

Meiotic irregularity refers to aberrant chromosome behavior during meiosis—the reproductive cell division that produces gametes (pollen and ovules). In cannabis, meiotic irregularities can result in unbalanced chromosome counts in sex cells, leading to aneuploid or polyploid offspring, sterility, or viability loss. Breeders and researchers document these events when working with unstable hybrids, interspecific crosses, or plants exposed to environmental stress during flowering. While rare in stable cultivars, meiotic irregularities are sometimes observed in first-generation crosses between genetically distant parents. Understanding these cellular events is essential for seed production optimization and strain stability assessment.

Breeders monitor meiotic stability when developing new lines, as irregularities reduce viable seed set and can introduce unwanted genetic variation. Selection for meiotic regularity—evidenced by high seed viability and consistent offspring traits—is a standard quality criterion in professional breeding programs.