Here is a brief introduction to the genetic make up of my rabbits' colour patterns, and there follows links to more information on rabbit colour genetics within my site.
Non - Extension (The E Series)
One of the recessive alleles on the E gene series, which controls the extension of colour to the fur tips is known as non-extension, denoted as e. Although they won't necessarily display the physical characteristics of the e gene (as it is masked by the dominant E allele) and pass it on to each of their offspring, all the rabbits I use in my breeding program carry this gene so I'm able to breed orange (agouti pattern non-extension), tortoiseshell (black self non-extension) and sealpoint (shaded self non-extension).
What the dominant normal extension E allele
allows the presence of black pigment to appear in the fur tips and in
the undercolours of practically all Netherland Dwarf varieties. All the
recognised varieties except orange, tortoiseshell and sealpoint are bred with
the E allele. Normal extension E does not
affect the intermediary band colour of the hair shaft.
sire (black self) dam (black self)
Below is more information on rabbit colour genetics