Anytime a breeder is crossbreeding and using plants from outside of the family, group or variety so a hybrid seed is produced as a result. Out-crossing results in the introduction of new and different genetic materials to each of the separate pools.
Filial Breeding is where siblings of the same generation are inter-mated to produce a new generation. The first hybrid generation of two (2) distinct true-breeding lines is characterized as the F1 generation.
If they are allowed to continuously open pollinate year after year, the results will be F3, F4, etc. Filial inbreeding with selection for the specific traits you seek is the most common method for creating a pure or a true-breeding population when breeding cross-pollinated species such as cannabis.
Backcross breeding is involved when repeated crossing progeny with the original parental genotype, most breeders will cross it with one of the original mother plants. This is known as the recurrent parent and this non-recurrent parent is called the donor parent.
When any plant is crossed with a previous generation it is known as backcross cannabis breeding. The main objective of backcross cannabis breeding is to create a seed population of individuals derived mainly from the genetics of one single parent (recurrent parent or donor).
The donor parent is chosen based upon a trait of interest, that the recurrent parent lacks, with the idea to introduce this trait into the backcross cannabis population. The backcrossing cannabis method is an appropriate scheme to add new desirable traits to a most perfect, relatively true-breeding genotype.
The best parent donor needs to possess the desired trait while lacking in nothing else. Backcross breeding cannabis is best when adding simple hereditary dominant characters that can easily be recognized in the offspring of each generation.
Backcrossing Cannabis to Incorporate a Dominant Trait
First, you will select the desirable plants that are showing the dominant trait that you want and hybridize the plant that you selected to the recurrent plant. The generation will produce a generation referred to as BC1 (Backcross generation 1) or other growers will use Bx1.
They will then select plants from the BC1 and hybridize it with the recurrent parent plant, resulting in a BC2 generation. The BC2 generation is then hybridized with the recurrent plant, resulting in BC3, and so on and so forth.
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