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Genetics 101

Chemotypes I, II, III: the cannabinoid groups

THC-dominant, balanced, and CBD-dominant — and why your line is one of them.

1 min read2026-05-2617 views

Cannabis is classified into chemotypes based on the ratio of THC to CBD in the flower. The ratio is genetic — it's set the moment the seed is made, and you can't change it later.

The three chemotypes
Type I (THC-dominant)
  • THC > 0.3% and high; CBD < 0.5%
  • What most modern commercial flower is
  • Genotype: BT/BT
Type II (balanced) & Type III (CBD)
  • II: THC and CBD roughly 1:1 — BT/BD
  • III: CBD-dominant, THC < 0.3% — BD/BD
  • Hemp falls in Type III by legal definition

Why this matters

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