Allele Inheritance

Allele inheritance describes how genetic variants (alleles) pass from parent plants to offspring in cannabis breeding. Each plant carries two copies of every gene—one from each parent—and offspring randomly receive one allele per gene from each parent, following Mendelian inheritance patterns. Understanding allele inheritance is foundational to predictable breeding outcomes, as traits like flower color, terpene profiles, and growth structure are controlled by multiple genes with varying dominance relationships. Breeders tracking allele frequency across generations can stabilize desired characteristics, create true-breeding lines, or introduce genetic diversity. This principle applies whether working with single-gene traits (like certain cannabinoid ratios) or polygenic traits (like yield or resin production) that involve dozens of loci.

Professional breeders use allele tracking through controlled crosses to fix desirable traits into stable cultivars and avoid unintended regressions. Population genetics tools help predict how allele frequencies shift across generations, enabling informed decisions about parent selection and line stabilization timelines.