YORK CHOCOLATE GENETICS
Author: Dr. Fulvio Bresciani
The
York Chocolate could be considered genetically a very
particular cat breed.
The lacking under-coat Lacking
under-coat surely is the most important phenotype characterizing the
breed. Many researches and crossing experiments would confirm the
existence of a gene controlling the under coat expression. In
particular, collecting many informations from York Chocolate pedigree
and applying statistical formulations on a lot of observations the
Mendel lows would result perfectly verified. The GENETIC HYPOTHESIS formulation may be explained as follows: The
gene controlling under coat expression has two alleles: The
wild allele “yuc” recessive producing a normal thick under
coat The initials of the following words York chocolate, under coat obtain the Yuc acronym Veterinary Department of Pisa University is very interested about the individuation of this gene, because it’s common opinion to consider cat and dog under coat the principal vehicle of many human allergies. The existence of a gene controlling these phenotypes could revolutionize all the classical research approaches in order definitively to solve this very common pathology. Another interesting aspect about the under coat gene identification is the possibility to transfer on other breed this hypoallergenic feature.
Another interesting York Chocolate physic expression surly is the particular white displacement on the coat of the bicolor subjects. Janet Chiefari, the first York breeder and Anna Baldi first European breeder just fixed a particular white displacement on the coat maintaining the same configuration in all successive generations. The white displacement on the York’s coat is called Spotting Particolor. In literature, several genetic experts kept an open mind about the existence of a allele called “particolor” inside the White Spotting gene. The
White
spotting
gene control presence and pattern of white masking the normal coat
pattern, and has four alleles:
non-spotted, "s", spotted, "S", particolor,
"Sp", and Birman, "sb". -
The spotted allele, “S”,
is mutant, is dominant, and produces white spotting which masks the
true coat color in the affected area. This is a variably-expressed
allele with a very wide expression range: From a black cat with one
white hair to a white cat with one black hair. The
York chocolate breed would totally confirm the Particolor allele
existence. Observing the “Sp” frequency expression of white
pattern transmission on several bicolor York chocolate of the Janet
Chiefari and Anna Baldi breeders would confirm perfectly the
inherit factors of the Mendel lows. Stability
about York chocolate phenotypes
Genes and polygenes transmission controlling the singular phenotypes of the York Chocolate breed may be considered perfectly stabilized. To day, a perfect and original standard describing exhaustively the body conformation and a complete genetic map consisting of all possible allele combinations of the York has been performed. This
very meticulous genetic work about classification of all York
chocolate phenotypic expressions had two advantages:
Gene
and Allele classification correlated
|
Genetic
Table reporting all allele combinations
|
Self
Lavander York
Chocolate GENES
GENES
PHENOTYPE
l
Yuc
b
d
C
a
i
s
w
RECESSIVE
l
Yuc
b
d
C
a
i
s
w
GENES
PHENOTYPE
l
Yuc
b
D
C
a
i
s
w
RECESSIVE
l
Yuc
b
d
C
a
i
s
w
PHENOTYPE
l
Yuc
b
D
C
a
i
s
w
RECESSIVE
l
Yuc
b
D
C
a
i
s
w
Lavander
bicolor Particolor York
Chocolate
GENES
PHENOTYPE
l
Yuc
b
d
C
a
i
Sp
w
RECESSIVE
l
Yuc
b
d
C
a
i
s
w
GENES
PHENOTYPE
l
Yuc
b
d
C
a
i
Sp
w
RECESSIVE
l
Yuc
b
d
C
a
i
Sp
w
Chocolate bicolor Particolor York Chocolate
PHENOTYPE |
l | Yuc | b | D | C | a | i | Sp | w |
RECESSIVE |
l | Yuc | b | d | C | a | i | s | w |
GENES
PHENOTYPE |
l | Yuc | b | D | C | a | i | Sp | w |
RECESSIVE |
l | Yuc | b | D | C | a | i | s | w |
GENES
GENES
PHENOTYPE
l
Yuc
b
D
C
a
i
Sp
w
RECESSIVE
l
Yuc
b
d
C
a
i
Sp
w
PHENOTYPE
l
Yuc
b
D
C
a
i
Sp
w
RECESSIVE
l
Yuc
b
D
C
a
i
Sp
w
_____________________________
References Fulvio
Bresciani was born in Saluzzo (Italy) on December 12th,
1960. He conferred a degree in Nuclear Engineering on February 1985.
Since 1987 working in optical design and signal processing applied on
spatial technologies. He is author of many technical papers and
several international publications.
Last time studying new mathematical models based on
quantitative genetic principles in order to solve multivariable
problems of non-linear systems. Together with Pisa University
developing mathematical models predicting hereditary factors on feline
selection. The more recently research developed regards the
individuation of a new gene controlling the under coat appearance. Bibliografy [1]
Feline Genetics Autori: R.
Roger Breton, Nancy J Creek – Edito (netpets 199
|