Effective Population Size
Effective Population Size (EPS) is a population genetics concept describing the number of individuals in an idealized population that would experience the same amount of genetic drift as the actual population being studied. In cannabis breeding, EPS helps quantify genetic diversity within a cultivar line or seed stock, accounting for unequal sex ratios, variable reproductive success, and generational bottlenecks. Breeders monitor EPS to understand whether a line maintains sufficient allelic diversity to avoid inbreeding depression. Low EPS indicates reduced genetic variation and increased risk of fitness problems across generations. EPS differs from census size—a line may contain hundreds of plants but have a much smaller effective population size due to selective breeding practices.
Effective Population Size strains
No strains tagged into Effective Population Size yet — they'll appear here as breeders submit lineage records under this terpene.
Effective Population Size (EPS) is a population genetics concept describing the number of individuals in an idealized population that would experience the same amount of genetic drift as the actual population being studied. In cannabis breeding, EPS helps quantify genetic diversity within a cultivar line or seed stock, accounting for unequal sex ratios, variable reproductive success, and generational bottlenecks. Breeders monitor EPS to understand whether a line maintains sufficient allelic diversity to avoid inbreeding depression. Low EPS indicates reduced genetic variation and increased risk of fitness problems across generations. EPS differs from census size—a line may contain hundreds of plants but have a much smaller effective population size due to selective breeding practices.
Professional breeding programs calculate EPS to assess long-term viability of closed populations and to plan outcrosses strategically. Understanding EPS guides decisions about how many parent plants to retain and how to structure breeding cycles to maintain genetic health.
Educational reference · Cultivar metadata only · No medical claims