Southernskies wrote:
There's an old thread on it which boiled down to 'magic'.
Alas (from the scientist in me) this is almost certainly what is truly at work here. Ultimately, things work in Arcanis due to the Word of Henry, and we mere mortals cannot hope to truly fathom such things without going mad. He's like Cthulu, only more Latino.
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The 'val gene' is effectively recessive, but becomes dominant if one parent is already an active val. Tried to work it out biologically and it was un-modellable using the available information (the 'one parent must already be a val' clause).
Again, I truly do not think that the recessive model works all that well, which is why I champion the "Dominant Gene" model. Of course, we're basing this on Mendalian genetics here, rather than more complex genetics that are very difficult to explain using text in a forums and based on a fictional High Fantasy universe, but it still doesn't line up.
For example (If Recessive):
For a val to be a val, they have to have a Recessive allele (call it 'h') while a Normal Human has a Dominant allele (call it 'H'). Inheritable genes have two sets of alleles (one from each parent) except in the case of individuals with genetic disorders (ie: missing a chromosome) or Men (the Y chromosome is, functionally, an incomplete X chromosome so it is missing some genes).
So, this means that Humans are HH (Homozygous) or Hh (heterozygous), with the Hh being carriers of the "Val" gene. This means that humans can breed as such:
HH + HH = HH 100 % of the time.
HH + Hh = HH 50% of the time, Hh 50% of the time.
Hh + Hh = HH 25% of the time, Hh 50% of the time, and hh 25% of the time.
The way recessives work is that to express that genotype/phenotype, you need two copies of the recessive gene (or, at least NO copies of the Dominant gene). In this case, Vals would be hh, which means that there is a statistically significant chance that two humans would produce a Val without any Val-sex going on that generation.
There is, to my knowledge, only a single instance of this happening in Canon, and that is during "Shadows of a Forsaken Past" where the soul of the Dark-kin killed by Hilmur is reborn to two normal human parents as a val'Hamen. There are no other times in Arcanis History that I can recall where this has happened, and in this case it was heavily implied to be an aberration of epic proportions from the 'way things usually go'.
Now, when you go the other way, you see that Vals almost NEVER can breed a Val using anything other than a Val:
hh (val) + HH = Hh 100% of the time (human)
hh + Hh = Hh 50% of the time, hh 50% of the time
hh + hh = hh 100% of the time.
This means that Val children would be a fairly uncommon (statistically), with only those who are heterozygous for the trait even standing a chance of producing Val offspring with a Val. Of course, a significant portion of the Val's in the world are probably of a noble background, which means that their 'marriage options' are probably more than a little limited. This means that the humans that they breed with are probably statistically MORE likely to be carriers of the val genes.
As an example of how this could work; The Balin family are known to be a vassal family of the val'Tensens, and are considered nobles/patricians in their own right. When arranging a marriage for their own children, the val'Tensen family will probably focus on other 'noble' lines above commoners for political alliances. With this history, there is a stronger likelihood that there are Val-genes kicking around their cells because (as stated above) the likelihood of producing a Val is not that great from such a union, but at least a significant portion of the humans produced are carriers. These matches would likely be even MORE favourable because these humans would have a far greater statistical likelihood of producing a coveted Val than just a random human would off the street.
For example (Dominant)
As stated before, I feel that the dominant theory fits better with past and present canon (going from 'breeding true' to the new 'no longer breeding true'). The reason for this is that in this system, you can only produce a Val if you have at least one Val parent. There is absolutely NO chance of producing a Val from just two humans:
Let us call this gene V (Val) with the non-val allele being v, so Vals would be VV (Homozygous dominant) or Vv (Heterozygous), and humans would be vv (homozygous recessive):
VV (Val) + vv (human) = 50% Vv (Val, human carrier), 50% VV (Val)
VV + Vv = 50% chance of VV, 50% chance of Vv
VV + VV = 100% chance of VV.
In all three above examples they will always produce Vals. That said, there is another combination which does NOT:
Vv + vv = 50% chance of Vv, 50% chance of vv (Human)!
Vv + Vv = 25% chance of VV, 50% Chance of Vv, 25% chance of vv (human)
This means that a Heterozygous Val (being a Val who had a Human ancestor) could produce a normal vanilla with a similarly Heterozygous Val or a normal human. This lines up with established canon--again, using the good Senator Tensin-Balin as an example, who managed to bag himself a val'Tensen wife and had at least two children. One (Cassicus) was a val'Tensen and another (Aphineas) was human, which would suggest that the Senator (vv) had a wife who was Vv, meaning that they had a 50/50 chance of Val or Human, which is supported by this example.Now, you could say that the above example of Tensin-Balin and val'Tensen can be done just as well with the recessive theory, and you would be correct. As stated, the good Senator is from a vassal family, and may well have Val ancestors to make him a carrier of the gene, which would also give a 50/50 split. However, I think the Dominant theory is the superior one because it also remains closer to the whole "Val's Breed True" story from the previous campaign. It would also be CLOSER (not quite as close as I'd like, but that's fiction!) to explaining the pariah status of the Vivisectionist, and it would prove that the birth of the val'Hamen from humans was a truly awe-inspiring act of the Gods. If they are recessive, then Val + Val = Human mixes are probably at least as common as V+V=V, so there should be far less stigma, and it makes the H+H=V rare, but not unheard of.
They both have their pros and cons, but I am strongly in favour of the one which actually fits more into the story (from my opinion).
Also, to the "It becomes dominant if the parent is a Val" doesn't hold water to me from a genetic point of view. In this case, it would simply be a Dominant gene as that solves all these issues quite nicely from a scientific point of view without even having to factor in magic and the gods and such.