Aneuploidy Chromosomal Imbalance

Aneuploidy refers to an abnormal number of chromosomes—cannabis typically carries 20 chromosomes (n=10 in haploid forms), so aneuploid plants deviate from this standard. This chromosomal imbalance occurs through meiotic errors, nondisjunction during cell division, or environmental stress during seed development. Aneuploid individuals often display irregular growth patterns, reduced fertility, sterility, or developmental abnormalities. In breeding work, aneuploidy is generally considered undesirable because it compromises vigor and reproductive reliability. However, rare aneuploid events have occasionally been observed in populations and documented in cytogenetic research, offering insights into cannabis chromosome structure and stability.

Breeders actively screen against aneuploidy through careful seed selection and plant health monitoring, as aneuploid individuals typically reduce seed set and genetic consistency. Understanding aneuploidy risk helps breeders identify environmental or genetic stressors that promote chromosomal instability during critical developmental windows.