Seed Predisposition

mal_crane

mal_crane

Well-Known Member
If you had carefully read the first paragraph, it clearly states that cannabis sativa runs two seperate genetic codes: one carrying an XY chromosome and one carrying a XX chromosome. The results found that the genetic code of XY can become either males or females depending on the environmental factors while the code carrying XX can only become female or hermaphrodite. It states that as early as the fourth node, environmental factors come into play in determining the sex of those plants carrying the XY genetic code for sex. To prove this, they used the very common cDNA AFLP method for finding differentiation of sex genes, and found that, when rebuilding the double stranded sequence of genetics that they tore down, the XY code doesn't begin to show differentiation between sexes until the fourth node of the plant has been grown. The reason you do not understand this SCIENTIFIC evidence is because you believe that all seeds have a dominant sex, and therefore believe that it is sex reversal that is happening. This is untrue based on these scientists findings. The heterogametic XY genetic code does not show a dominant sex gene until at least part way through the vegetation stage, clearly proving that environmental factors can give the X or Y gene a shove into being dominant in plants carrying the XY genetic sex code.
 
mal_crane

mal_crane

Well-Known Member
What good is a moderator who can't admit they are wrong when presented with the scientific evidence proving that they are?
 
skunkushybrid

skunkushybrid

New Member
I don't see where it says that. All I'm reading is about how they cloned the DNA from mrna.

In dioecious plants, sex determination (male and female genes or combinations of heterochromosomes) occurs at the fertilisation stage. This is scientific fact.

I don't know what you're reading... maybe you need to paste the whole paper... because I really don't see the things you are saying...
 
mal_crane

mal_crane

Well-Known Member
Your ignorance is astounding, take your head out of your ass and learn to read, I'm through wasting my time with someone who can't accept scientific fact.
 
skunkushybrid

skunkushybrid

New Member
mal_crane said:
If you had carefully read the first paragraph, it clearly states that cannabis sativa runs two seperate genetic codes: one carrying an XY chromosome and one carrying a XX chromosome.quote]

Yes I read that, and i think you'll find that one is male and the other female... if you read it properly. lol.
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mal_crane

mal_crane

Well-Known Member
Yes moron and the XY code can become male or female depending on environmental factors!!!!!!!!!!!!!!!!!!!!!!!! Thus negating your all seeds being predisposed THEORY! Congratulations you haven't proved to be completely ignorant.
 
skunkushybrid

skunkushybrid

New Member
sexual expression in dioecious plants happens on a genetic level. there are 3 genes responsible for this, 2 of which are A and B7, i forget the third. They control sexual expression in a predetermined way. They do this by setting heavy, endogenous levels of auxin and cytokinin regulators.

Morphological sex differences are not apparent in juvenile plants or in vegetative tissues.

Each genotype will maintain characteristic endogenous levels of growth regulators, even when subjected to tissue culture.

The environment stands no chance against genetic predisposition. All the environment can do is turn a plant hermie.

There's some actual facts for you... moron.
 
skunkushybrid

skunkushybrid

New Member
To make any kind of informed judgement on that i would have needed to watch them grow. They are only a couple of days out of the medium.

Males will grow taller and faster than the females. The females will tend to concentrate on width.

The best time to be 70% sure is around a week after veg'... but then you will have needed to watch them grow. As the veg' dwindles on male and females will grow true to form, as is genetically predetermined by them.

It is a fact that males grow taller and faster than females. Basic cultivation, mate.
 
F

faralos

Well-Known Member
I think it's the same as in all of us. As an egg we are predertermined to be either male or female. sometimes we change in the womb. I think all of nature does this to some degree. so Yeah, I think a seed could go 'balls up' so to speak and switch sexes partway thru due to stress or mebbe' it's just bored and wants to try a switch:mrgreen:
 
F

faralos

Well-Known Member
am into my 8th day of flowering, on my first big crop (16 plants) I just 'weeded' out 3 males that showed yesterday. These three were the tallest, by about 4" than any other of my babies. I suspected they would be males. I was right, so MOST of the time (depends on the strain. too), males grow faster, taller.
 
skunkushybrid

skunkushybrid

New Member
faralos said:
am into my 8th day of flowering, on my first big crop (16 plants) I just 'weeded' out 3 males that showed yesterday. These three were the tallest, by about 4" than any other of my babies. I suspected they would be males. I was right, so MOST of the time (depends on the strain. too), males grow faster, taller.
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Yes, MOST of the time males will grow taller, faster... they do this almost from the start, maybe it is right at the very start... either way, seeds are most certainly predisposed to be one sex or the other.
 
metagrower

metagrower

Well-Known Member
nowstopwhining said:
very good points, Im thinking it isnt environment alone, I think genetic make up plays a role as well.

I will try and make up a little scenario here:

Lets say we have two seeds A, and B.

Lets say seed a has A has a 40/60 chance to be Female/male While seed B has a 25/75 chance to be Female/male due to genetic makeup alone.

Now with environmental stress during the veg stage lets say seed A now has a 60/40 chance to be female/male and seed be has a 45/55 chance of being female/male.

so now obviously both plants have a chance of going either way but seed A now has a greater chance of being female once placed into flowering. This could obviously go either and I just made this data up but it does an ok job of representing what im getting at.

Im thinking this is how environmental stress plays a role. I dont think plant sex is based solely on genetic makeup or environmental stress, rather a combination of the two.

obviously I could be wrong but it is fact that certain species of plants are effected sexually by environmental stress.
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I may be a little late on this, but you have to consider that if sex were undetermined physiologically prior to flowering, then clones taken during veg would possibly be a different sex than their mother. However, this is not the case. Thus, it must be determined in the seed.

Is my logic flawed on this?
 
nowstopwhining

nowstopwhining

Too many brownies
metagrower said:
I may be a little late on this, but you have to consider that if sex were undetermined physiologically prior to flowering, then clones taken during veg would possibly be a different sex than their mother. However, this is not the case. Thus, it must be determined in the seed.

Is my logic flawed on this?
Click to expand...

The reason why clones are always the same is because they are a 100% identical copy of the plant it came off of.
 
Moldy

Moldy

Well-Known Member
Okay, I'm not a "posting" type guy but this is kinda interesting to me. My first grow I germed 10 White Widow seeds. I'm in a dry climate inside and out. I didn't cover the seedlings or anything, just under a CWF indoors. I got 2 females out of 10 planted.

So, this year (March 1) I plant 3 WW and 3 Skunkberry. This time they were germed in a humidity chamber and grew for about 2 weeks. I then moved them into my new grow room and now they are all showing female. Now I'm over my med limit and have to kill three of them! Ouch! (I'm keeping just one of the WW) I think the humidity had a role in it. The WW seeds were from the same batch of 20. Maybe in another few years this can be varified to me but for now it's just data or something to note. I'll post the results next grow but it could be just a fluke.
 
J

jeff3dfx

Active Member
skunkushybrid said:
well, if a seed is predisposed to be one sex or the other how can it be that the environment can play a part in how many males there are? For this to happen, a pre-disposed plant must complete a full sex reversal.
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I can only comment from my experience and my understanding of why a plant may do this for survival purposes. I think that a plant would force itself into going male in times of a stressful environment to ensure seed production for future generation of plants.

In normal conditions there will be an even 50/50 split males and females, but when times get tough the genetics from the seed realize that not all other plants may endure the stressful times and therefore convert to survivalist mode turning hermy or doing a full out change of sex to ensure a new season of growth through self seed production.

this is really all just theory in my head, feel free to comment on it
 
bicycle racer

bicycle racer

Well-Known Member
it seems to me that females have the ability to save themselves thru self pollination if need be this would generally be a last resort biologically because there is no genetic diversity produced thru this method of reproduction. it seems to me that only females have this trait like my lemon tree in the yard without this ability a whole species could die out if pollen was not available. i think only females have this ability i have never seen a true male produce female flowers or produce any growth that is not male in nature. i have heard fem seeds are produced (one method) using enviromental stresses or colloidial silver gibberelic acid etc to produce pollen. none of these methods actually change genetics so this would mean that all female seeds have both chromosomes right? but you cant stress a male into making female flowers so maybe there are true male seeds. but all females have herm traits. some strains thru envirement over generations are more prone to this behavior than another strain that developed in a different local with better conditions. i would bet that any female cannabis seed can be made to produce pollen with differences in strain making it easier or harder to do. male seeds seem to be the only ones that are truelly one sex only:confused: i find this interesting because im working with herm seeds and pollen currently on some crosses:peace:
 
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