Words keys :

Phenotype : with of the outer characters of a subject (aspect)
Genotype : with of the genetic characters of a subject
Recessive : weak person, not dominant,incapable to manifest if carried from both chromosomes does not accredit
Sex-legacy : character legacy to the sexualchromosomes, than in the birds is XX for the males and XY for the females
Autosomale : character legacy to the not sexual chromosomes
Dominant : contrary of recessive, able of manifest even if present in a single chromosome of a brace of chromosomes accredits
Eumelanina : black melanina
Feomelanina : tawny melanina

A decisive impulse to the breeding in captivity of the Goldfinch, but in a generalized manner of all the Finches, has been given from the advent of the color mutations, ereditablesi genetic anomalies that transform the phenotype of the subject changedregarding its ancestral shape.
The today sure fixed mutations on the Goldfinch are:
Tawny, recessive mutation sex-tied, characterized from the transformation of the black eumelanina in tawny. The effect that ne derives is that the zones previously interested from the blackone become of tawny tonality, and the zones interested from feotransform in a brown much warmth.     

Mutation Agate , recessiva sex-tied, characterized from one partial reduction of the black eumelanina and from one nearly total passing of the tawny feomelanina. The contrast between the black one nearly unchanged of the wings and the tail, and the back(gray-silver) and the chest (nearly completely white man), confers to such subjects a truly entusiasmante aspect.    
In the photo the left Ancestral male
   to right male Agateto, 

Mutation Isabella , sex-tied recessive, gushes from the Agate crossing for Tawny, from which the formation of ancestral genotype double bearers (passepartout), able subjects of giving to feminine descendancys Agate, Tawny and, for crossing-over,Isabella.
Fenotype is introduced like a Tawny one diluted.
Mutation Pastel , sex-tied, characterized recessive  from reduction of the eumelanina and the feomelanina, with final fenotype result of a general color pastel of the colors of the cape.
Satinč mutation , tied recessiva sex, are without doubt the beautifulst today fixed mutation in the Goldfinch. The passing of the feomelanina and nearly the total reduction of the eumelanina confer to the Goldfinch a truly spectacular livery, with the design as soon as pointed out from beige a much slender   that is detached clearly from red of the template and the yellow of the crossing the andirons.
Yellow, autosomale mutation dominant, from me officially fixed in 1997 and described on Ornithological Italy ofJanuary 1999,
characterized from one macrocoscop icinfiltration of yellow on all the cape of the subject. It is the onlymutation that instead diluting, adds lipocrome where lipocrome notperhaps is.
The more valuable subjects have the design with littles lobbers and the lipocrome yellow more candid possible.
A lot interesting would have to be the final aspect deriving from the summary one of the Yellow mutation with the sex-lied mutations, above all Agata and Satinč.
Other not common mutations but in phase of sure stabilization are the Opal and the Albino , both recessive autosomale.
.

 

 

 

Raffaello Sanzio (1483-1520)
Madonna del Cardellino (1507)
olio su tela
Firenze, Uffizi