When an interesting or useful trait is identified in
a dog, owners would breed from that dog in the
hope of the trait being passed on.
Over many rounds of such breeding attempts,
especially where two dogs with the same trait
are bred with each other, traits became fixed.
There are over 400 breeds of dog in the world
and all are maintained as pure-bred stocks
through selective breeding, which aims to
maintain a closed genetic lineage.
Most dog traits follow simple genetic rules.
Traits are often referred to as being dominant or
recessive. Just like humans, dogs have two
copies of each gene (one inherited from mom
and one from dad), but the litters making up
each gene can be slightly different. If a gene
influences for a particular trait (such as hair
color, looks) then slight differences in the litters
in a gene can result in differences in hair color or
looks in that animal.
Some of these differences dominate over others,
so that particular variant of the gene is
described as being dominant.
In this case, the hidden trait is called recessive.
Occasionally, a dog inherits two genes for a
recessive trait and you get a surprise!
It is common practices to mate the animals who
only possessed the traits that they found
desirable for offspring.
By using the selective breeding mating process.
Selective breeding may involve the traditional
breeder's approach,which involves breeders
examining the chosen trait that they want to
move on to their offspring and selecting breeds
that exhibit a higher amount or extreme values
of that trait.
Eliminate Unwanted Traits
Selective breeding can, and has, effectively breed
out undesirable traits in some animals.
Things like illness and disease have been greatly
lowered in animals that have been bred to reduce
NEVER BREED MOTHER TO SON, FATHER TO
DAUGHTER OR FULL BROTHER TO SISTER
"THAT IS CALLED INBREEDING."