Cannabis Genetics: What it is, how it works, and why it matters when choosing a strain

Learn about cannabis genetics, how crosses, genotypes, phenotypes, and chemotypes influence aroma, potency, and effects. The plant's DNA is the master plan that determines whether it produces a resinous goddess or an ugly duckling. Understanding it won't make you Gregor Mendel, but it will make it easier to know what to expect from seeds created by experts like Wizard Trees or Nine Weeks Harvest .

Genotype vs Phenotype: DNA or the time you dedicate to it?

Imagine that the genotype It's your plant's source code, etched into the seeds: " Hey, I have the potential for 25% THC and a bubblegum smell ." It's what it inherits from its genetic parents.

He Phenotype , on the other hand, is how it turns out in the final photo: it depends on you, the sun, the water... Two sister seeds of Gelato can turn out very different, one with buds the size of fists and the other skinny and with lots of leaves, just due to environmental conditions.

Why does it matter? Because we risk blaming the seed when the problem lies with the grower 's setup. Breeders create the potential; but you have to know how to unleash it!

How are new varieties created?

To create a new variety, breeders combine two genetic lines that possess desired characteristics. This process involves:

1. Parent selection: Plants with outstanding qualities such as unique terpenes, high THC, robust structure or pest resistance are chosen.
2. Controlled cross: Breeders pollinate a female plant with pollen from a selected male plant. The result is seeds with a mixture of traits from both parents.
3. Phenohunting: From the resulting seeds, breeders germinate many plants and select only those that show the best genetic expressions. This process can last months or years.
4. Stabilization: To ensure a variety is consistent, the cross is performed several times until stable results are obtained generation after generation.

Classical vs modern lineages

Although historically we have talked about:

• Indica: Short, compact plants, fast flowering, and more relaxing effects.
• Sativa: Tall, thin, they take longer to flower and produce energetic and creative effects.
• Hybrids: A genetic mix that combines characteristics of both, the most common today.

Currently, the rankings Indica / Sativa have fallen a little behind : today chemotypes take precedence over morphology.

Chemotypes: The chemistry of each plant

Chemotypes classify cannabis according to its predominant cannabinoids:

• Type I: High in THC – Powerful and psychoactive effect.
• Type II: Balanced THC + CBD – Moderate effect.
• Type III: High in CBD – Mild and therapeutic effect.

Let's not forget about terpenes!

Terpenes , responsible for the aroma and part of the effect, are largely determined by genetics. That's why some varieties have citrus profiles, others earthy, floral, or creamy ones.

Why does genetics matter when buying seeds?

• It affects the aroma and the flavor
• Determine the flowering time
• It influences productivity and size
• Define the final effect
• It provides clues about resistance to pests and fungi.
• Ensures consistency between crops

Most influential modern genetics

• Gelato Crosses: The basis of many current genetics, it stands out for its sweet aromas and potent hybrid effects.
• Runtz Crosses: Fruity terpenes, compact structure and vibrant colors.
• OG Crosses: Robust, earthy, and very potent classics.
• Zkittlez Crosses: Complex aromas of fruits and flowers, highly demanded worldwide.

In summary...

Cannabis genetics are the black box of every strain. Choosing good seeds is key to obtaining healthy, aromatic, and potent plants. Understanding how crosses, phenotypes, and terpenes work will help you select the perfect strain for your collection.