About Dr John Armstrong

As well as a professor of biology and genetics Dr. John B. Armstrong studied and researched Canine Health. His passion for poodles led him to study poodle pedigrees and to research the effects of inbreeding in the poodle population.

Diversity and the Purebred Dog

The Nature of Diversity Think of genes as recipes. They carry the instructions for the various components that go into making up an organism. Each recipe specifies a particular component, and different individuals may carry different versions of the same recipe. (In the jargon of genetics, we say that they carry different alleles of a […]

Eliminating Mutations – The Impossible Dream

Though it is not practical to eliminate all deleterious mutation, the incidence of affected individuals may be significantly reduced through a combination of intelligent breeding practice and the development of DNA tests. Why do we have mutations? Mutations are changes in an organism’s DNA that potentially affect the correct functioning of genes. They occur naturally […]

Breeding Schemes

Breeders often talk about inbreeding and outcrossing as though they were the only possibilities — and generally with negative comments about the latter. There are other possibilities, and I have long been a proponent of assortative mating. It is not a theoretical concept that doesn’t work in practice; I know several breeders who do it […]

Diversity And The Purebred Dog

The Nature of Diversity Think of genes as recipes. They carry the instructions for the various components that go into making up an organism. Each recipe specifies a particular component, and different individuals may carry different versions of the same recipe. (In the jargon of genetics, we say that they carry different alleles of a […]