Based on the experienced breeders working on Angora chinchillas, they claim this mutation an accumulative recessive. A full expression of an angora shows fur length of more than 2'', while the non-Angora chinchillas have only half length of the fur. To have a full expression of the Angora baby, the dam and sire should both have Angora (long fur) genes. Though, to breed one Angora to another could have 100% Angora babies in full expression, it reduces the quality of the kits, such as the fur thickness and strength, conformation, or their weight.
To have quality Angora kit(s), breeders could use one Angora with an Angora carrier, or use one Angora carrier with another carrier. The offspring may not express 100% Angora kit(s), however this way could strengthen the hybrid vigour and improve the quality, which is highly recommended.
The Angora carriers look like ordinary non-Angora chinchillas, but they express considerably longer fur than the non-Angora kits within one month from birth (the following picture shows an Angora carrier @ 1 month age), and the former have much weaker fur strength than the latter when they are mature, which could be distinguished easily through touching by experienced breeders.