Posted December 4, 200915 yr So in this thread I am attempting to bring together a comprehensive guide of the order of dominance of a number of varieties which occur on the same allele. For example, recently in the Great Yellow Face Symposium I learnt that on a certain place on the DNA sequence of a budgerigar the following varieties have an order of dominance from most to least, lets call that place A. A. Normal Green, Golden Face, Yellow Face Mutant I, Yellow Face Mutant II and then Normal Blue. And from another intriguing thread dedicated to Dilutes I learnt that on another place of the DNA sequence of a budgerigar the following varieties have an order of dominance from most to least, lets call that place B. B. Greywing, Clearwing and then Dilute. My question, specifically to our Genetic Gurus Nubbly, RIP and Finnie (but any one else please feel free to jump in) is- Are there any OTHER examples of where multiple varieties occur together and an order of dominance is observed?
December 4, 200915 yr That is a good question. It would be nice to have a list of them, wouldn't it? What about ino and lacewing? I think I've heard that there can be crossover, where the ino and the cinnamon get separated, so that would imply that they are on separate, but very close loci. We talk a lot about color genetics, because we can visualize them. But I'm sure there must be examples of multiple alleles for other traits, like health, bone structure, feather quality, temperament. As far as the yellowface and dilute series go, it seems like you have something similar, but when you pick it apart, you can separate out small details. (like FBC being different to greywing.) I wonder if there are different types of opaline, or different types of spangle, but we just lump them all together because the differences are so small. Food for thought, but no answer to your question. Maybe someone else knows.
December 4, 200915 yr I went off to google budgie genetics, and found an interesting item on Wikipedia. It has a table that lists the loci of the different mutations. I don't know how complete it is (doesn't mention BES), but it appears that the only other locus to have interacting alleles, other than the b locus (green, yf, blue) and the dil locus (greywing, clearwing, dilute) , would be the ino locus. Somehow that involves Texas Clearbody. In any case, it is an interesting list of mutations, and the article has several links, references that I am going to go back and check into further. Here is the link to the article: Budgie genetics, Wikipedia
December 4, 200915 yr I went off to google budgie genetics, and found an interesting item on Wikipedia. It has a table that lists the loci of the different mutations. I don't know how complete it is (doesn't mention BES), but it appears that the only other locus to have interacting alleles, other than the b locus (green, yf, blue) and the dil locus (greywing, clearwing, dilute) , would be the ino locus. Somehow that involves Texas Clearbody. In any case, it is an interesting list of mutations, and the article has several links, references that I am going to go back and check into further. Here is the link to the article: Budgie genetics, Wikipedia Interestingly one of the references is Down Under Aviaries which was our own member RIPBudgies own webpage :rofl:
December 4, 200915 yr Interestingly one of the references is Down Under Aviaries which was our own member RIPBudgies own webpage :rofl: Cool, I haven't gotten that for, i got bogged down at the MUTAVI site! Can't wait! (Have not been able to get much done today... :rofl:) Edited December 4, 200915 yr by Finnie
December 4, 200915 yr Interestingly one of the references is Down Under Aviaries which was our own member RIPBudgies own webpage :rofl: Cool, I haven't gotten that for, i got bogged down at the MUTAVI site! Can't wait! (Have not been able to get much done today... :rofl:) The host for her webpage went down a week or so ago and took every ones webpage with it :rofl: Edited December 4, 200915 yr by KAZ
December 4, 200915 yr Oh No! Is that fixable, or is it a permanent problem? Not fixable. Oh, I'm so sorry for RIP :rofl:
December 5, 200915 yr So in this thread I am attempting to bring together a comprehensive guide of the order of dominance of a number of varieties which occur on the same allele. For example, recently in the Great Yellow Face Symposium I learnt that on a certain place on the DNA sequence of a budgerigar the following varieties have an order of dominance from most to least, lets call that place A. A. Normal Green, Golden Face, Yellow Face Mutant I, Yellow Face Mutant II and then Normal Blue. And from another intriguing thread dedicated to Dilutes I learnt that on another place of the DNA sequence of a budgerigar the following varieties have an order of dominance from most to least, lets call that place B. B. Greywing, Clearwing and then Dilute. My question, specifically to our Genetic Gurus Nubbly, RIP and Finnie (but any one else please feel free to jump in) is- Are there any OTHER examples of where multiple varieties occur together and an order of dominance is observed? :question: Renee, I have found this article, which explains the order of dominance of the ino locus: click here
December 5, 200915 yr Author Multiple alleles A multiple allelic series arises whenever a wild-type gene mutates more than once and so has more than two alternative forms. The most simple series comprises a total of three alleles; the original wild-type and two different mutant types. If we assume this basic model as being true for a series of alleles containing a blue gene and a parblue gene (a situation which is quite common across parrot species), we can examine this idea as before. Previously we looked only at the dominant wild-type B, and the recessive b. Now we can slot in the parblue allele, labelled bp in the correct genetic tradition, between the other two so that we have: B - the wild-type, normal, or green bp - the mutant parblue b - the mutant blue Although there are six genetic types of bird, I have made the assumption that the wild-type allele is fully dominant to both the parblue and blue alleles and also that these latter two alleles are co-dominant with each other. This is certainly so in the budgerigar and there is every indication that, at least in some instances, the same can be said of the blue series of genes in other parrots. Let us take a look at the consequences of this assumption. At its most simple, each allele in a multiple allelic series is completely recessive to any allele above it in the series and completely dominant to any below it in the series. But, in the present case, we are supposing that the parblue allele is only partially dominant (co-dominant) to the blue allele. This means that: * The two different genetic types of Parblue, bpbp and bpb, will also be visually different * and shows that the proposition of a multiple allelic series including only one parblue gene, co-dominant with the blue, is capable of explaining the occurrence of two distinct Parblue varieties in any species. It is probably the most simple genetic model capable of this explanation and is the theory, as we shall see later, accepted to be true for each of the Parblue varieties in the budgerigar. On a more generalised note, the names given to the different parblue and blue forms, and their appearance, will vary from species to species although every effort should be made to unify the system as much as possible. Some of the more interesting observations to be brought out from consideration of the above table are: * The six possible genetic types of bird can be mated in 21(!) different combinations. * This time there are three genetic types with identical alleles which will breed true when mated like to like: BB, bpbp, and bb. * A Green can be split for parblue (Bbp) or it can be split for blue (Bb), but it cannot be split for both. * There are two types of Parblue, the DF Parblue (bpbp) will be true breeding and the SF Parblue (bpb) will be split blue. In the budgerigar three parblue varieties have traditionally been recognised; the Goldenface or Australian Yellowface, the Yellowface Mutant 11, and the Yellowface Mutant 1 or Creamface (Aust). However, this last one is now thought to be the unusual product of two blue alleles which have mutated in different ways (See article Gene function in Yellowface budgerigars by Peter Bergman in these pages.) The single-factor, or heterozygous, forms of the first two are sometimes referred to as Seagreens. Parblue varieties have also been established in a number of other species (even where no Blues are known) and a wide range of names have been used. Attempts are being made to standardise on the name Aqua, but others you will come across include Turquoise, Marine, Seagreen, and even Pastel Blue(!). © Clive Hesford: March 2001 Edited December 5, 200915 yr by renee
December 5, 200915 yr okay i hope i dont get this wrong but ... lacewing is co dominent to albino as if you breed a albino cock bird to a lacewing hen you get all albinos the cocks being /split for lacewing then if you breed a albino / lacewing cock to a cinnamon hen you get normal/cinnamon/ino cocks cinnamon /lacewing cocks albino hens and lacewing hens that to me says that as albino then cinnamon then lacewing in order to domanance as an albino cock to a cinnamon hen rezults in normal/cinnamon/ino cocks and albino hens and lacewing cock to an albino hen rezults in ino/lacewing cocks and lacewing hens so...... so here we can see that lacewing may be co domanaint to albino yet coincide with cinnamon this is my theory :question:
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