MARBLED/CALICO CONVICT BREEDERS - INFO / GENETICS THREAD

  • We are currently upgrading MFK. thanks! -neo
coyotethug said:
I have crossed these multiple times and this is what the numbers lead me to believe.

Pink gene is autosomal recessive. This means you need two copies of the allele to express the trait and it is not altered by sex.

Calico gene which is what I assume you are calling marbled would show up regularly in first generation (F1) offspring from calico pink x wild type. This leads me to believe it is a dominant allele. My offspring were approximately 50% calico so my calico breeders must have been heterozygous themselves.

Sent from my DROID BIONIC using MonsterAquariaNetwork App
Click to expand...

Which would be impossible unless it is indeed a dominant gene.
Interesting read...not my fish.
http://gregthecrazyfishguy.wordpress.com/2012/09/17/convict-cichlid-marble-genes/
 
I think it is much more complicated that simple dom/rec, co-dom, or etc. I think it is going to be more like human eye color predictions. Multiple mutations occuring in different genes, making phenotypic predictions without known genetics very tough if not impossible.
 
Absolutely - we've already discovered that it's not a simple dom / recessive gene. That's why I started this thread - so we can start to figure it out :)
 
This would be an interesting undergraduate project for someone. Time to do your Gregor Mendel impression!
 
An incomplete co-dom gene? Not sure thats entirely accurate though...the way this gene acts reminds of certain genes in various hybrid fish, the short body gene, fader gene, they act like a co dom gene with a super form...except when they don't, lol! Some of this has to do with certain genes not affecting certain species, like the fader gene. The less amphilophus in the hybrid, the less chance of getting faders...except this is not a hard and fast rule. And the sb gene seems to be somewhat similar to marble too, the more "doses" of the gene, the more extreme the phenotype, but not always. Hybrids seem to break many rules of genetics. All this to say that this marble gene also breaks many rules, although imo these marble cons don't appear to be hybrids at all...it's a poser alright, GL with this guys. I'll be following this thread and any others you post. Very interesting stuff.
 
So, if the data from the study done by the person in that link that was given is correct a "light marble" should have one gene for pink and one gene for marble and both mutations are located on the same allele.

IF this is correct, I should get from my two "light marbles" pictured above(way above), a ratio of 25% Pinks 50% light marbles and 25% heavy marbles. Is a correct assumption based on those "facts"?(the question is for those people who actually read the whole link)

It's a good thing that my first spawn is doing great and should be free swimming any day now. I will report the ratios as soon as they are old enough to see details.
 
While that article is good, and informative, I disagree with the whole idea of Lightly marbled vs Heavily marbled, simply because there's no black and white (LOL) dividing line between the two. The babies range from all pink, to heavily marbled, and everything in between. It would be one thing if all the fry were EITHER heavily, OR lightly marbled, but that's not the case. (At least, from a heavily marbled X pink spawn.) Well, I just attached a photo of the father, from this past fall/early winter - and I guess you could call him "medium" marbled, which is a perfect example of what I am talking about - neither "light" or "heavy." (And the mother, who was a dyed shortbody convict. None of the fry are shortbody, thankfully.) It will be interesting to see if any shortbodies pop up from the line breeding. The mother passed away last week, actually - her body became more deformed over time - I think it was a swim bladder infection. She was a cutie-pie.

But, this summer my batch of fry will be ready to breed, and we'll know more.
I'll breed a female (not sure which yet) with the father, which is "heavily" marbled, and I will breed a pair of the pink fry, a pair of lightly marbled, and a pair of heavily marbled, and a pair of "medium marbled" as IMG_1666.JPGwell as one of each "type" of the marbled, to one of the pink fry. In short, if there is ANY consistency, I will find it this year.

IMG_1666.JPG
 
That male has a nice head. My male must either be very young for his size or perhaps the possibility of his being a hybrid is interfering with hump development.
 
You must log in or register to reply here.
MonsterFishKeepers.com
Top Bottom