I don't find much discussion of patterns of Mendelian inheritance beyond in discussions of the particular traits they relate to, there's also some sloppy usage of the ideas without substantiation and I'd like to open some discussion on how these things work.
I'm going to share what I've gathered so far as a starting point would love to hear some of the things I'm missing and how they inherit or whether people have any corrections
Flowering Alleles ranked by dominance
1.
Short Day generally speaking, plants that flower when days are less than 12 hours (possible multiple alleles with different sensitivity/hour requirements to trigger flowering but this is generally fairly speculative)
2&3?
Super Autos (possibly 2 subdivisions with distribution related to latitudes and length of lifecycle, plants living accross Eurasia in environments where short day plants would not finish but which do not demand the extreme speed of the russian allele that is the basis of the standard auto allele spread by low ryder
100 day e.g. Serbia the mid latitude auto varoetu
120 day furthest south auto variety e.g. georgia
4.
Auto (Standard/Low Ryder allele) the auto plants that live furthest north in nature e.g. Russia 70-85 day lifecycle
Speaking to Stitch from Flash Seeds some time ago I was given the impression that when a plant has two alleles for autoflowering the longer living allele dominates the shorter type, however I've recently seen a thread suggesting it can cause an unusual form of co-dominance.
https://www.icmag.com/ic/showthread.php?t=291950
Whether this is caused by a certain pair from the three auto varieties or something else idk, input welcome and needed
Since they're recessive and almost all auto plants have the most recessive allele an auto plant will most likely be homozygous for whichever auto trait they have.
Essentially a cross between any auto and a short day will lead to a short day F1 generation but all of which carry their parent's auto allele whichever that may be.
A 25% auto flowering rate will occur in the f2 or a 50% autoflowering rate if back crossed to the auto-flowering parental line.
If the F1 generation shows autoflowering characteristics the short day parent is a carrier and the outcome will essentially function as a BX for that characteristic and roughly half the plants from that seed stock should be expected to auto-flower and crosses between them and other auto strains with the same auto allele will breed true for the characteristic.
Interaction between the two auto alleles when crossed together is as yet unclear but if they do dominate the "standard" auto then in an f1 cross 100% will express the trait and carry the standard auto allele, in another generation the f2 plants will be 75% super auto (with 25% being homozygous i.e. truebreeding) and 25% standard auto. In a Bx from the f1 to the standard auto strain there would be a 50% homozygous Standard Auto and 50% Super auto rate that would all be carriers of the standard auto.
In a Bx to the super auto parental line there would be 50% homozygous super autos and 50% super autos that carry the standard auto allele. Dominant traits are most effectively selected by reproductive success, an option that is rather harder with auto strains as individuals can not be preserved through cloning until after their reproductive success has been measured.
Purple Flowers
The trait for purple colouring in the flowers (which is separate from the colouration which starts in the leaves and requires far colder conditions to express) appears to also be caused by a single allele but unlike the Auto traits above the purple flowering trait is dominant.
Purple budded plants may therefore not be homozygous for the trait and in a cross the F1 may only show 50% purple budded plants. whether the purple will express in male flowers is also unclear so reversing female plants with the purple buds or reversing male plants to see if they produce purple female buds would be way to guarantee the f2 are produced from plants which express genes to produce purple buds
In well selected F2 generation 25% will breed true for purple buds. 50% will express purple but carry the green buds and 25% will be green.
Leaf shapes
The Webbed gene that Ducksfoot etc exhibit is a recessive trait and therefore inherits like the autoflowering gene (25% in the f2, 50% in a Bx) and any plants which express the trait will breed true in crosses with any other plants that also express it.
Short/Tall growth shapes based on internode length appear to have their own inheritance patterns in Marijuana Botany Tall is listed as dominant when this is used an an example however I am not clear if this is a hypothetical example, I have not received confirmation on this and heard some conflicting reports.
Leaf colouring traits
Unclear how it inherits, more dependent on environment for expression than the flower based colouring trait.
Anyway if anyone has any case studies from their grows to help us look at how traits you're working inherit please comment, I'd love to see how many more simple inheritance patterns we can compile.
I'm going to share what I've gathered so far as a starting point would love to hear some of the things I'm missing and how they inherit or whether people have any corrections
Flowering Alleles ranked by dominance
1.
Short Day generally speaking, plants that flower when days are less than 12 hours (possible multiple alleles with different sensitivity/hour requirements to trigger flowering but this is generally fairly speculative)
2&3?
Super Autos (possibly 2 subdivisions with distribution related to latitudes and length of lifecycle, plants living accross Eurasia in environments where short day plants would not finish but which do not demand the extreme speed of the russian allele that is the basis of the standard auto allele spread by low ryder
100 day e.g. Serbia the mid latitude auto varoetu
120 day furthest south auto variety e.g. georgia
4.
Auto (Standard/Low Ryder allele) the auto plants that live furthest north in nature e.g. Russia 70-85 day lifecycle
Speaking to Stitch from Flash Seeds some time ago I was given the impression that when a plant has two alleles for autoflowering the longer living allele dominates the shorter type, however I've recently seen a thread suggesting it can cause an unusual form of co-dominance.
https://www.icmag.com/ic/showthread.php?t=291950
Whether this is caused by a certain pair from the three auto varieties or something else idk, input welcome and needed
Since they're recessive and almost all auto plants have the most recessive allele an auto plant will most likely be homozygous for whichever auto trait they have.
Essentially a cross between any auto and a short day will lead to a short day F1 generation but all of which carry their parent's auto allele whichever that may be.
A 25% auto flowering rate will occur in the f2 or a 50% autoflowering rate if back crossed to the auto-flowering parental line.
If the F1 generation shows autoflowering characteristics the short day parent is a carrier and the outcome will essentially function as a BX for that characteristic and roughly half the plants from that seed stock should be expected to auto-flower and crosses between them and other auto strains with the same auto allele will breed true for the characteristic.
Interaction between the two auto alleles when crossed together is as yet unclear but if they do dominate the "standard" auto then in an f1 cross 100% will express the trait and carry the standard auto allele, in another generation the f2 plants will be 75% super auto (with 25% being homozygous i.e. truebreeding) and 25% standard auto. In a Bx from the f1 to the standard auto strain there would be a 50% homozygous Standard Auto and 50% Super auto rate that would all be carriers of the standard auto.
In a Bx to the super auto parental line there would be 50% homozygous super autos and 50% super autos that carry the standard auto allele. Dominant traits are most effectively selected by reproductive success, an option that is rather harder with auto strains as individuals can not be preserved through cloning until after their reproductive success has been measured.
Purple Flowers
The trait for purple colouring in the flowers (which is separate from the colouration which starts in the leaves and requires far colder conditions to express) appears to also be caused by a single allele but unlike the Auto traits above the purple flowering trait is dominant.
Purple budded plants may therefore not be homozygous for the trait and in a cross the F1 may only show 50% purple budded plants. whether the purple will express in male flowers is also unclear so reversing female plants with the purple buds or reversing male plants to see if they produce purple female buds would be way to guarantee the f2 are produced from plants which express genes to produce purple buds
In well selected F2 generation 25% will breed true for purple buds. 50% will express purple but carry the green buds and 25% will be green.
Leaf shapes
The Webbed gene that Ducksfoot etc exhibit is a recessive trait and therefore inherits like the autoflowering gene (25% in the f2, 50% in a Bx) and any plants which express the trait will breed true in crosses with any other plants that also express it.
Short/Tall growth shapes based on internode length appear to have their own inheritance patterns in Marijuana Botany Tall is listed as dominant when this is used an an example however I am not clear if this is a hypothetical example, I have not received confirmation on this and heard some conflicting reports.
Leaf colouring traits
Unclear how it inherits, more dependent on environment for expression than the flower based colouring trait.
Anyway if anyone has any case studies from their grows to help us look at how traits you're working inherit please comment, I'd love to see how many more simple inheritance patterns we can compile.