[45th]

In other words we can get auto and feminised seeds and regular...is there a process to establish male dominant or exclusive male seed?

[Peaty Wheaty]

Originally Posted by 45th

In other words we can get auto and feminised seeds and regular...is there a process to establish male dominant or exclusive male seed?

In a word: no.

A female has 2 X chromosomes and a male has 1 of X and 1 of Y.

Now, any progeny gets one chromosome from each of its parents. In the case of the mother, it will always be an x chromosome. So in order to guarantee that any progeny is male, you must ensure that all progeny inherit the Y chromosome from the father plant.

That could only be achieved if the father had 2 Y chromosomes. And as far as I know, only a mutation would allow a male to exist without inheriting an X chromosome from its mother.

On the other hand, male flowers on a non-hermie female will only produce pollen with 2 X chromosomes, which is why the progeny is guaranteed to be female.

[Seaf0ur]

I'd say it's probable, yes.

xx and xy is not accurate in plants. not all cannabis is monoceous, and you can have polyploids that are "XXXY" and still male...

In the same way females are reversed with STS or CS, a male plant can be reversed with ethephon.
If a male plant reversed was pollinated with another male successfully, I would expect the offspring (if viable) to be male in the majority.

[ceausescu]

I did a cross some years ago and the offspring turned out to be 95% male i started a lot of seeds that year.
How is this possible?

[jack hairy]

i crossed two males together recently.
got two seeds out of them, and they are one male and one female.
waiting to see what they do.

[Betterhaff]

^ ^ That would make sense if following the XX, XY model. A bigger sample of seeds may have yielded more males.

[Only Ornamental]

It is entirely possible .
Though, what you need first is a 'super male', a plant containing two Y chromosomes. Cross that one with a normal female and you get 100% male offspring.
There are only a few posts here on IC about super males (like THIS one here) but they exist and talk for example about difficulties determining homozygous Y allosomes or the increased lethality of Y pollen.

If you reverse a male and cross it with another male, you get statistically speaking 75% phenotypical males and 25% normal females. In theory, from what I've read, there's roughly a 2:1 distribution of phenotypical males to females. Nearly half the plants are normal males whereas a few will/should be YY males. AFAIK the latter are, at least on a macroscopic level, indistinguishable from males but many die somewhere during the pollination and/or seed formation causing the unexpected 2:1 ratio.
Only microscopic analyses (such as staining chromosomes and hoping to recognise the X and Y) or a test cross will tell you if a male is a common one or the YY you seek.

[45th]

good information, thank you!

[ceausescu]

I must of gotten a super male.
Have some crosses growing this year hope no super male parent this time.

[kopite]

Originally Posted by Peaty Wheaty

In a word: no.

A female has 2 X chromosomes and a male has 1 of X and 1 of Y.

Now, any progeny gets one chromosome from each of its parents. In the case of the mother, it will always be an x chromosome. So in order to guarantee that any progeny is male, you must ensure that all progeny inherit the Y chromosome from the father plant.

That could only be achieved if the father had 2 Y chromosomes. And as far as I know, only a mutation would allow a male to exist without inheriting an X chromosome from its mother.

On the other hand, male flowers on a non-hermie female will only produce pollen with 2 X chromosomes, which is why the progeny is guaranteed to be female.

It has been done, male seed lines are useful.

https://www.icmag.com/ic/showpost.ph...8&postcount=51