Escondido X sb Green Texas update

[izzy_here]

I've got a feeling that any of my sb fry, no matter what the length, would produce 50% sb fry when bred to a normal.

But then that would happen if it was a normal (homozygous) domninant gene too

 

[izzy_here]

It seems one of my pairs have spawned, it will be very interesting to see how many fry are sb.

 

[Fish_Man_Dan]

you should also probably consider that different species may carry several different genes that cause SB, and different species may express it dominant to or recessive to the normal gene. a homozygous normal bred to a homozygous recessive (any gene, not just albinism or SB) will produce 100% normal LOOKING offspring, 50% of which will only carry the recessive gene, not express it. so if SB is dominant (homozygous in one parent) and normal is recessive, then all the babies will be SB, carrying normal.

we also have to consider co-dominant and other factors in geneology (i forgot the others at the moment... lol). i just felt like i should probably input, since i saw a lot of misused words, and this is the stuff i've been studying for years in school and personal experimentation.

btw, good luck to the OP!!

 

[izzy_here]

Thank you Dan, I have definitely not studied genetics that much in a classroom setting so If I do misuse a few terms forgive (and please correct) me. I theorize that indeed there are a few types of sb gene, just as there is more than one type of dwarfism in humans. Hence my saying "the sb gene as it is known in bp or fh". I also theorize that the sb con's that are NOT hybrids are probably a recessive form of sb.

You wrote...."so if SB is dominant (homozygous in one parent) and normal is recessive, then all the babies will be SB, carrying normal." Then how in the world did I get 50% sb fry? For that matter how in the world did I get any sb fry at all?

I only have personal knowledge of one type of gene that would act in this manner and thats what I know as a double factor dominant. A dominant gene with a lesser (dom gene from one parent) form and a "super" (dom gene from both parents) form. For instance pastel/super pastel ball pythons. Two different phenotypes, same (dominant) gene.


If you look in the link kalbatah provided there are pics of fry from a parrot x midas mating. Several of the fry look a little sb but clearly not as sb as the mother. I have seen similar results on forums, in pics, vids etc. I have also seen the same results as I had. All of this seems to point toward a double factor dom gene imo.