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Posted by JR
on 5/8/2009, 1:13 pm, in reply to "Viagara was originally invented to treat Angina,..."
205.188.117.70
Not to be difficult or contradict just for the sake of contradicting. But I think you tripped over your own explaination with the introduction of kanoko. kanoko, of course, is not a color gene but a pattern gene.
I know you know this, but for the lurker--
It is very natural and tempting to see color and pattern on fish as distinct sections of a fish. But that is not who genes work- genes are about gene expression in areas of the body.
the wild carp stock of the region, at the time, held all the possiblities at that moment, as Brady as said. This includes all recessive and mutation potential. So it seems unending but it is indeed limited ( just limited in the extreme!)
If you take kohaku ( and some of you will remember the heat I got for suggesting this to our Brit friends) there is the solid form, the all red form, the kanoko form and the spotted form. This is all the same fish with the same genetics- just different genetic expression. So as the roulette wheel spins for a 100,000 spawn, you will see a serious of genetic phenotypes based on three prinicples;
1) the dominate recessive genes expressed
2) certain LINKED ( more than one single dominating recessive gene) recessive genes dominating and resulting in a common phenotype. ( this is that 'blue eye/red hair' thing we see in humans.
3) a series of dominating sequence recessive genes more dominate than another series of recessives. And might indeed show a mix or incomplete dominace in that recessive battle. This can result in PARTIAL gene expression. ( pastel colors are an example of that in some cases).
So kanoko is alway there but it requires complete recessive domination to be seen in phenotype. And since it is a weak recessive, the odds of it appearing on individuals is low. And in the wild type carp where dominate genes abound- chances are nil.
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