Black cheeks: black flanks or orange flanks?
Posted: Mon Mar 11, 2019 4:30 am
Hi , as promise
i know i'm very bad teacher and sorry for my poor english
letters in minus concern only flankc color and can't be considred as mutation
abbrs : bf black flancks , of orange flanks , bi-c f bi-colored falncks
The original version of the black cheek mutation that appeared in Germany in 1983 was the version giving complete and intense black cheeks in both males and females, hence the name of the mutation. The flanks of the males were then orange.
As the work of this mutation progressed, a phenotype of black-flancked males appeared around the end of the 1980s. In 1993, Maurice Pomarède already differentiated between two types of black cheeks: black cheek with orange flanks (bcof ) and Black-flancked BC (BCBf).
This difference in phenotype is only visible on males. However, a female will only be able to breed black-flanked black-cheeked males if she is born from a strain of black flank blackcheeks; and conversely for the version with orange flanks.
In competition, the BCbf version that has been selected for the establishment of the BC male standard. For the female, no matter the version since the difference in phenotype is only visible in males.
Both versions are "mixable": so it's not about two different mutations. Indeed, the coupling of a BCbf male with a female from a BCof strain will give male BC males with black and orange bi-color flanks. This phenotype of BC male with bi-colored flanks can be qualified as intermediate that we note BC b-cf ("bcf" for bi-colored flanks). It can be assumed that the females resulting from such a cross will be all black cheeks and also "carrier" of the two factors flanks black and orange flanks (BCb-cf).
In addition, it has been observed that a black cheek "bearer" of the two black flanks and orange flanks crossed with a partner black flank cheeks will give in the males 50% of black flank cheeks and 50% of males with bi-colored flanks.
Whether it is a simple factor or an allelic version of the black cheek gene, there is still some doubt. However, to consider on the one hand the existence of two alleles of the black cheek mutation and, on the other hand, that neither of these two alleles dominates the other simply explains the observations made. According to this simplified theory, here is the heredity of the phenotypes that can be deduced for the two factors:
BCbf x BCbf = 50% male JBCbf and 50% female BCbf;
BCbf x BCof = 50% male BC b-cf and 50% female BC b-cf;
BC b-cf x BCbf = 25% male BCbf, 25% male BC b-cf, 25% female BCbf and 25% female BC b-cf (difference of non-distinguishable phenotype in females BCbf and BC b-cf);
BC b-cf x BCof = 25% male BCof, 25% male BC b-cf, 25% female BCof and 25% female BC b-cf (non-distinguishable phenotype difference in females BCof and BC b-cf);
BC b-cf x BC b-cf= 12.5% male BCbf, 25% male BC b-cf, 12.5% male BCof, 12.5% female BCbf, 25% female BC b-cf and 12.5% femaleBCof (difference in phenotype not distinguishable in females );
BCof x BCof = 50% male BCof and 50% femaleBCof;
According to this logic, a subject BCbf can be generated only if both parents are at least carrying the factor BCbf (hence BCbf or JNfb).
NB: special case a Black-Face male with two types of black cheeks will tend to have completely orange flanks, which tends to show a dominance of BCof on BCbf in the presence of the black-face factor.
i know i'm very bad teacher and sorry for my poor english
letters in minus concern only flankc color and can't be considred as mutation
abbrs : bf black flancks , of orange flanks , bi-c f bi-colored falncks
The original version of the black cheek mutation that appeared in Germany in 1983 was the version giving complete and intense black cheeks in both males and females, hence the name of the mutation. The flanks of the males were then orange.
As the work of this mutation progressed, a phenotype of black-flancked males appeared around the end of the 1980s. In 1993, Maurice Pomarède already differentiated between two types of black cheeks: black cheek with orange flanks (bcof ) and Black-flancked BC (BCBf).
This difference in phenotype is only visible on males. However, a female will only be able to breed black-flanked black-cheeked males if she is born from a strain of black flank blackcheeks; and conversely for the version with orange flanks.
In competition, the BCbf version that has been selected for the establishment of the BC male standard. For the female, no matter the version since the difference in phenotype is only visible in males.
Both versions are "mixable": so it's not about two different mutations. Indeed, the coupling of a BCbf male with a female from a BCof strain will give male BC males with black and orange bi-color flanks. This phenotype of BC male with bi-colored flanks can be qualified as intermediate that we note BC b-cf ("bcf" for bi-colored flanks). It can be assumed that the females resulting from such a cross will be all black cheeks and also "carrier" of the two factors flanks black and orange flanks (BCb-cf).
In addition, it has been observed that a black cheek "bearer" of the two black flanks and orange flanks crossed with a partner black flank cheeks will give in the males 50% of black flank cheeks and 50% of males with bi-colored flanks.
Whether it is a simple factor or an allelic version of the black cheek gene, there is still some doubt. However, to consider on the one hand the existence of two alleles of the black cheek mutation and, on the other hand, that neither of these two alleles dominates the other simply explains the observations made. According to this simplified theory, here is the heredity of the phenotypes that can be deduced for the two factors:
BCbf x BCbf = 50% male JBCbf and 50% female BCbf;
BCbf x BCof = 50% male BC b-cf and 50% female BC b-cf;
BC b-cf x BCbf = 25% male BCbf, 25% male BC b-cf, 25% female BCbf and 25% female BC b-cf (difference of non-distinguishable phenotype in females BCbf and BC b-cf);
BC b-cf x BCof = 25% male BCof, 25% male BC b-cf, 25% female BCof and 25% female BC b-cf (non-distinguishable phenotype difference in females BCof and BC b-cf);
BC b-cf x BC b-cf= 12.5% male BCbf, 25% male BC b-cf, 12.5% male BCof, 12.5% female BCbf, 25% female BC b-cf and 12.5% femaleBCof (difference in phenotype not distinguishable in females );
BCof x BCof = 50% male BCof and 50% femaleBCof;
According to this logic, a subject BCbf can be generated only if both parents are at least carrying the factor BCbf (hence BCbf or JNfb).
NB: special case a Black-Face male with two types of black cheeks will tend to have completely orange flanks, which tends to show a dominance of BCof on BCbf in the presence of the black-face factor.
He has red eyes.