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homozygous cannabis seeds

Phenotype: It is the visible expression of the genotype, that is the set of physiological and morphological characteristics of an individual, which result from the interaction of its genotype with the environment. It can be summarised by the following formula:

Test cross is a method that allows breeders to better understand the genotype of the hybrids they create. Let’s take an example. Imagine you’ve just created a purple leaved hybrid and want to fix the trait so that the colour is inherited by the offspring. At this point, you can assume that the gene encoding it will be:

Why should hybrids be stable?

The more compatible the parent plants, the more stable will be the progeny. In fact, if both parent plants are homozygous for some given traits, so will be the offspring. If, for instance, two Indica-dominant strains are crossed together, they will share many traits and thus they will be highly compatible, resulting in a highly stable hybrid which won’t entail a very long breeding process as there won’t be too many recessive genes to eliminate.

*Where ‘P’ and ‘g’ stand for purple and green, respectively.

All cannabis plants are compatible with one another – i.e. they can be crossed together and reproduce themselves – and as such they meet the first stage of compatibility. That said, when it comes to breeding marijuana plants, there are different degrees of compatibility, as the concept is closely linked to stability.

Crossbreeding between four selected males and females can produce 10,000 different combinations of the targeted hybrid. These variations can be very subtle, and it is the master eye that distinguishes heroes from zeroes.

A stable genetic like Skunk #1, for example, spontaneously produced the unique Cheese strain with no input from the growers. The particular seed recombined the DNA in a novel way that was outside the expected phenotypic variations. So don’t be bummed if you get some radical variations. You might stumble on the next big thing!

Desirable dominant traits can be isolated and undesirable traits are gradually eliminated. Unstable parent stock risks producing heterozygous offspring. There is a risk of greater variation, and undesirable, unpredictable traits can emerge.


Variability and predictability are the variations in phenotypes and the expected ratio of distribution of different phenotypes. Genetics 101 foresees that breeding with stable parent stock will typically produce predictable results.

Outbreeding can solve these regressive attributes. When the breeding population is small, inbreeding depression can occur more rapidly. This is often a problem in Schedule 1 countries. The law means there simply isn’t the space to generate enough interbreeding stock to select prime examples.

The same occurs with marijuana. A batch of stable hybrid seeds can produce a plant resembling a grandparent or original landrace, the same way a redhead might happen here and there in a family with very few redheads in their genealogy. This is rare and can be an inconvenience or a boon.

Offspring will be distributed relatively evenly across all the seeds in the batch. 25% will be father-dominant, 25% will be mother-dominant, and 50% will be hybrids with combined features.