Articles about American Pit Bull Terrier
...to start reading this article from the beginning please click on here...Locus E Series: Extension (Em) black mask (Ebr) brindle (E) extension of dark pigment (f) restriction of dark pigment The Locus E alleles affect the extension of dark pigment, and all of the alleles at this locus interact with those of locus A. (Em) - BLACK MASK: This allele is dominant to all others in the series and is expressed as a black mask on dogs that are not black. One researcher, Robinson, considers the evidence that the black mask belongs in the E series as unconvincing and assigns it to a different series. (Ebr) - BRINDLE PATTERN: The brindle allele produces the brindle pattern with stripes or bars of dark pigment on a background of light pigment. In dogs with the dominant (As) allele, which produces a solid coat of dark pigment (brown or black), the (Ebr) allele is masked because there is no light pigment on which it can act.
