Can the tendency towards one sex still be possible however? I know it’s not a large enough test pool for it but for example my banana female only throwing 5 male bananas? The rest of her offspring were mix sex.
No, there is no way that I know of that the sex of a BP can be influenced. If there were, breeders would exploit the heck out of it to get more of the sex that they want.
I’m not asking if you can force a single sex by a reproducible mean. Just if it’s possible for an individual to tend to produce one. It’s an anomaly. I’m curious on a geneticist’s thoughts.
It has been somewhat proven to be forced in early bananas and CGs because the gene was sex linked. Now that the gene has been crossed out more it seems like the link is possibly degrading as more ‘makers’ are tossing the opposite sex. If you wanted male AND female you had to have a female. If you wanted females with the gene you needed a cg male with a dam who was also cg.
I tend to be a bit Adamsian and a bit Holmesian on this:
-Anything is possible, but somethings are wildly improbably
-When you remove the impossible whatever remains, no matter how improbable, must be the truth
With that said, I do not believe the impossible has even been close to removed from the board here so looking for the improbably is unnecessary
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This… Is not correct. The linkage between the genes is a fixed factor.
What we are seeing is simply the correcting of sample bias:
In a perfect world, if you flip a coin, you have a 50/50 chance of it landing on heads. What if reality was that the minting process made it more likely that the coin would land on tails? How many times would you have to flip to know the exact rate of deviation? Say you flip one hundred times and determine that the actual rate is 49/51, what happens if I flip the coin one million times? Will the rate remain 49/51? Or might the ratio change?
The rate everyone tends to quote is the one the community collectively agreed to back when only a few hundred Bananas were being produced? Would you expect it to be identical now that (multiple) tens of thousands have been produced??
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Awesome feedback. Thank you Travis! 
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Thought I would provide an update on this as I’ve discuss this with the breeder, and it still isn’t making any sense to me(or him).
He’s paired a male from the same clutch as my male(so brothers), and has produced 3 males as shown below:
He also said he’s done all the tests and they all indicate CG.
So if they are CG, then I don’t understand how my male isn’t CG.
I think Travis has summed it up already for you.
I’m inclined to very much agree. Looking at his photo, I don’t believe he is either
You really should have him shed tested if you are absolutely positive that he must be banana/CG
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I’m not doubting that he isn’t CG, as none of his offspring seems to be CG. I’m just stomped that he’s brother seems to be(as his offspring and tests indicate) but he isn’t.
If the dam to my male was CG, and that’s where his brother got the CG gene, then his brother should be a female maker. The three that his brother has sired above are all males, so unless the gene has crossed over on all those three(which is probably unlikely), I don’t know how one would be CG and the other not.
I was more curious if anyone else could explain how this would be possible. The breeder has also said the the dam has only been with male maker CG/Bananas.
It happens. There’s a 1-5% ish chance of a female cg being born from a male maker sire. So I’m sure the opposite can be true with a male not being cg
If the CG was the mother, it doesn’t matter as any sex could have been cg or not cg. For example, my female CG tossed 6 eggs out of the 2:4 only 1:2 were CG.
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Are you saying that his brothers CG could have come from the dam, but instead of him being a female maker he’s a male maker? - If so, do you know if there is any record of this happening before?
If not, then he should be a female maker and I wouldn’t expect him to produce 3 males from the same clutch with the CG gene.
What was the pairing for the parents again?
Even if the father was a cg female maker, they can still occasionally toss a male CG.
A female CG will pass the gene to either sex. A cg male born from a CG female is a female maker. A CG male born from another CG male is a male maker.
But regardless of the ‘maker’ they can still sometimes throw a curve ball and toss a CG of the opposite sex. That also means that they can still occasionally have offspring that will be the correct sex but not inherit the gene. Which sounds like the case with your boy?
@t_h_wyman can correct this if I’m wrong. He is almighty and knowledgeable in the ways of genetics.
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The parents to my male and his brother that produced the three offspring I posted earlier today was:
Sire - CG Pastel Black Pastel Mystic(male maker)
Dam - Special Mystic Pastel
I didn’t think it was possible to have a male or female maker that didn’t pass the gene onto the relevant sex.
Nothing to correct, you summed it up very well
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Just because the brother to your animal is CG that does not mean that your animal has to be CG. I have green eyes but my brother has blue. I have dark brown hair but my brother is dirty blonde. This is how genetics works, why are you stumped?
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This has been explained above. It is also long documented in the history of the mutation itself.
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I was stumped as from the research I had done, and from what it also says on MM here, I thought if you had a male maker CG(banana) then all his CG offspring would be male whilst the rest of the clutch(non CG’s) would be female.
Therefore, as my male came from a male maker CG, I would expect him to have been CG. I knew that there was a small percent chance of a male maker producing a female and vice versa, but I wasn’t aware that you could have a male maker that doesn’t pass the gene onto his male offspring.