F1 Fast Version genetics: genetic explanation
In 2014, Manolo of Sweet Seeds sent us an article on F1 Fast Version strains; we excerpted a fragment of this article, where he explains his breeding work in detail.
F1 Fast Version strains are F1 hybrids resulting from a cross between a photo-dependent and an auto-flowering genotype, the result is a photo-dependent hybrid with very rapid flowering. The photo-dependent parent gives the F1 hybrid its photo-dependent trait in the entire offspring, while the auto-flowering parent gives the F1 hybrid a very rapid flowering and ripening time for buds, again, in the entire offspring.
[caption id="attachment_7084" align="alignnone" width="500"]
Big Devil F1 Fast Version[/caption]
The trait that determines automatic or photo-dependent flowering depends on a single gene. This gene presents two possible alleles, a dominant one (F) that codifies the photo-dependent flowering trait (in Spanish “Fotodependiente”) and a recessive one (a) that codifies the automatic flowering trait. As the allele that codifies the auto-flowering trait is a recessive one, it must be inherited from both parents (homozygosity) for this type of flowering to manifest itself; as a result, all auto-flowering plants are (aa), and have received an (a) gene from their father and mother respectively.
[caption id="attachment_7085" align="alignnone" width="500"]
Killer Kush F1 Fast Version[/caption]
On the other hand, all photo-dependent genotypes (elite clones) of the Sweet Seeds group of mothers that we used in the production of F1 Fast Version are homozygote for the dominant trait expressed by their photo-dependent flowering; this means they are (FF), as they have inherited an (F) gene from their father and mother respectively, as could be inferred from the tests performed on the offspring of these clones.
[caption id="attachment_7086" align="alignnone" width="500"]
Sweet Cheese F1 Fast Version[/caption]
The first generation produced by crossing these two genotypes (FF) and autos (aa), in accordance with Mendel’s first law of uniformity of first-generation hybrids, are 100% hybrid individuals (Fa), and, as (a) is recessive and (F) is dominant, 100% of the population is photo-dependent, and no auto appears. This first hybrid generation between homozygotes for one or multiple genetic traits is known as hybrid F1. Since the seed is an F1, if these (Fa) seeds are crossed with each other to obtain multiple seeds, the following generation F2 – in accordance with Mendel’s second law of trait segregation in the second filial generation – will not produce 100% of Fast Version individuals (Fa), but rather a mixture of individuals, i.e. 25% of autos (aa), 25% of photo-dependent individuals (FF), and 50% of Fast Version individuals (Fa). The only generation that is 100% Fast Version (Fa) is F1 Fast Version.
Manolo of Sweet Seeds
Big Devil F1 Fast Version[/caption]
The trait that determines automatic or photo-dependent flowering depends on a single gene. This gene presents two possible alleles, a dominant one (F) that codifies the photo-dependent flowering trait (in Spanish “Fotodependiente”) and a recessive one (a) that codifies the automatic flowering trait. As the allele that codifies the auto-flowering trait is a recessive one, it must be inherited from both parents (homozygosity) for this type of flowering to manifest itself; as a result, all auto-flowering plants are (aa), and have received an (a) gene from their father and mother respectively.
[caption id="attachment_7085" align="alignnone" width="500"] Killer Kush F1 Fast Version[/caption]
On the other hand, all photo-dependent genotypes (elite clones) of the Sweet Seeds group of mothers that we used in the production of F1 Fast Version are homozygote for the dominant trait expressed by their photo-dependent flowering; this means they are (FF), as they have inherited an (F) gene from their father and mother respectively, as could be inferred from the tests performed on the offspring of these clones.
[caption id="attachment_7086" align="alignnone" width="500"] Sweet Cheese F1 Fast Version[/caption]
The first generation produced by crossing these two genotypes (FF) and autos (aa), in accordance with Mendel’s first law of uniformity of first-generation hybrids, are 100% hybrid individuals (Fa), and, as (a) is recessive and (F) is dominant, 100% of the population is photo-dependent, and no auto appears. This first hybrid generation between homozygotes for one or multiple genetic traits is known as hybrid F1. Since the seed is an F1, if these (Fa) seeds are crossed with each other to obtain multiple seeds, the following generation F2 – in accordance with Mendel’s second law of trait segregation in the second filial generation – will not produce 100% of Fast Version individuals (Fa), but rather a mixture of individuals, i.e. 25% of autos (aa), 25% of photo-dependent individuals (FF), and 50% of Fast Version individuals (Fa). The only generation that is 100% Fast Version (Fa) is F1 Fast Version.
Manolo of Sweet Seeds
E
Exitable
