The Bluebonnet Norfolk Terrier Club does not recommend, guarantee, endorse, nor rate these recommendations or contributors, their kennel or their stock. The purpose of this section is to share the knowledge and experience of breeders who have vast experience in whelping and raising puppies. The tips and tricks below are intended to augment qualified veterinarian care, not as a substitute for qualified veterinarian care of the dam and puppies.
Complex Modes of Inheritance(e.g. Polygenic traits)Many diseases that are of great concern to both breeders and veterinarians are caused not by a single gene but by the interactions of several genes. To make matters more difficult for the breeder and the geneticist, the phenotype (or the appearance of the trait or disease) can often be modified by environmental influences such as nutrition or exercise. Examples include hip dysplasia, elbow dysplasia, heart disease and epilepsy.
From fxhntnorwich.Here is a link for abasic genetic mode of inheritancetaught in most freshman science classes. The graph shows a basic mode of inheritance for pea seeds. Most of us can interpolate the theory and see the correlation for inheritance of the fluffy gene/ allele as we are not sure it is a simple recessive . The percentages are NOT 25% : 50% : 25% for the entire litter but for EACH individual puppy.