Inheritance Page 2

Breeders Corner

Kafka said, "All knowledge, the totality of all questions and answers, is contained in the dog."

Please submit your article, publication or hyperlink to an article to Judi Hartell. DataDawg@Austin.rr.com

Submissions

Quote

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.

Ca nine DNA Testing for Hair Length, Curl, and Furnishings

Breeding for and Purchasing Better Dogs

GUIDE TO CONGENITAL AND HERITABLE DISORDERS IN DOGS

Drawing The Lines: A look at why some sire lines fade and other flourish. (This article was written about horses but applies to dog breeding as well.

DIRECT SIRE LINE or TAIL MALE LINE AND TAIL FEMALE LINE BREEDING

Penetrance and Expressivity

Planned Breeding

Mendelian Genetics

The traits produced by a gene can be characterized as dominant or recessive. Dominant traits can be expressed when only one copy of the gene for that trait is present. Recessive traits carried on autosomal chromosomes can be expressed only when two copies of the gene are present (because the gene on the paired chromosome is usually expressed instead). Dogs with one copy of an abnormal gene for a recessive trait (and who thus do not have the disorder) are called carriers. With codominant traits, both copies of a gene are expressed to some extent. An example of a codominant trait is blood type. If a dog has one gene coding for blood type A and one gene coding for blood type B, the person has both blood types (blood type AB). Whether a gene is X-linked (sex-linked) also determines expression. Among males, almost all genes on the X chromosome, whether the trait is dominant or recessive, are expressed because there is no paired gene to offset their expression.

Behavior patterns are hereditary. Breed for them.

Recessive Traits: Rules of Thumb: 1. The trait may skip one or more generations. 2. Only those individual who carry a pair of the determiners display the trait. 3. An animal carrying only one determiner can be discovered only by being mated to another carrying the same determiner. 4. To be evident, the trait must come from both sides of the family.

Members