Traduccion en ingles
Dear Salvatore Maione,
As we always say: we love questions¡¡¡
And as we always also say: our genetic theories are based in the
practice of many many years of breeding gouldian finches, and in the
necessity of understanding these genetic processes that are ocurring
in this bird and that we could never obtain answers on these
processes in any bird literatures .
Maybe also it was of grate utility to be fanatic to the reading of
detective histories, like the teacher Poe, Raymond Chandler, Ellery
Queen, Arthur Conan Doyle, Agatha Christie, George Simenon and many
other, this wonderfull hobby should have given us a natural intuition
and an easiness for the logical reasoning. We explain this because in
fact we don't have sophisticated devises to read genetic sequences,
but we don't lie when we said that in a season we have obtained more
than 2000 guoldian finches of different mutations, and neither with
special vitamins nor with super producing eggfoods, and also in small
aviaries.
But like we said, we live in an island and we sometimes delay 3 or 5
years in introducing fresh blood to our aviarios. Perhaps if we lived
in a grandiose and expectacular community like the European one , we
could have less inbreeding, but this wonderful small place is what we
got ,so,let us take grate things out of it ¡¡¡¡
Yes it is difficult to understand the complete chromosomal
representation of the wild gouldian finch, we are trying to give our
small contribution, result of a long experience. We can assure that
the representation that we have contributed with, is not the complete
one, there exist many subprocesses that would be to difficult to
represent, for example when we assign only two variables for the
lipocromic process of the body( the sea-green case which is controlled
by the dilution gene of lipocroms),other variables should exist for
the head, variables for the beak, variables for the abdomen, variables
for the wings, variables for the neck, this is a demonstrated fact ,
because we see so many sea-green gouldians with different tonalities
and if we would like to obtain a true harmonic sea-green, it is
necessary to get a few chicks from a couple and also that this couple
of parents be not so homocigotic regarding the lipocromic dilution
processes .
At the beginning of our articles we outline that we won't use many
technical words for not falling in errors and for not complicating in
excess the main matter.
Also, most of the genetic processes that happen in the gould are the
same ones that happen even in flowers, for example in the wikkipedia
many of these words can be read that explain demonstrated genetic
processes.
We have already mentioned as main creator of our variations to the
famous genetic recombination ,together with the dilution gene of the
melanins.
But the process to which you make reference or questions must be the
epistacia. This process has been demonstrated to act not only among
genes of the same chromosome but among genes of distant chromosomes.
We won't speak about other species, but we will give some examples in
the Gouldian finch that justify this type of relationship to our
understanding.
For example: one day a friend of Internet requested us the graphic
representation of a crossing between a wild Gould male with an ino
female and the possible descendants.
Intuitively we represented the wild one and the Ino and their
descendant with the letters PB ( purple breasted -PB,concerning the
Brest color), this friend at once wrote back outlining that we had an
error in our genetic calculations.
But our answer was: if we have a Ino gouldian finch (fenotipicaly it
will always be of white chest, although you never used the white
chested gene) that is the result from previous several crossings
using wild purple breasted, and that also in breeding in endogamy with
their children always gave purple breasted (the wild ones that were
out of this crossing we mean), then for logic deduction we can
understand that the ino gene affects the melanics processes but it
doesn't modify them, and that the Ino gene that is recessive and sex
linked affects other autosomics genes (like the purple breasted) that
is even dominant on its variations¡¡¡¡¡¡
Besides we can outline the epistasia relationship between not only
two genes of different chromosomes, but also among three or four genes
, for example a wild gouldian red headed or orange headed purple
brested , doesn't have the same liprocromic coloration on the head
that a wild gouldian red headed or orange headed white brested, Then a
pastel gouldian (melanic dilution)black headed purple breasted has
certain tonality of gray on the head,but this same pastel gouldian
(melanic dilution) black headed white breasted has a more diluited
tonality of gray on the head,
Then as a logic conclussion , a ino gouldian (genetically purple
breasted) black headed, has a residual determined tonality of
melanines on the mask(for some reason it opposes itself to its total
dilution ), these must be the cuban inos , our inos.
But an ino gouldian (most of the Europeans) that genetically should be
White breasted, for what we have read is the common believe they must
be crossed with White breasteds , it dilutes a lot more the black head.
Then we have as example of relationships among genes of different
chromosomes, the ino gene, that surprisingly inactive momentarily the
endocrine function of the purple breasted gene .
Something similar it happens among the inhibitor of melanizacion gene
of the mask and with the melanizacion gene of the mask that they are
sex linked genes ,and they control the possible lipocromic coloration
of the mask, orange or red, and they are genes located in another
chromosome.
There are more examples with the dilution gene of the melanins and
with the dilution gene of the lipocroms, but we have chosen to
mention those better known.
Juan
&
Diliam