There is an abundance of issues that stem straight
from the small gene pools that human beings have manipulated in dogs; 60 percent of golden retrievers will die of cancer before they turn eight.
Not exact matches
Gene therapy has the potential to save lives, but the
pool of people who suffer
from the orphan diseases, or conditions that pharmaceutical companies have historically ignored, is relatively
small.
This is nature in action and a
small part of the inevitable process that will remove religiousness
from the
gene pool.
Even if Noah impregnated all of them at once, or his sons did their respective wives, and then they all repeated the process 14 years later (give or take) when the 1st offspring became fertile, how could different races with distinct physiological adaptation arise
from such a
small, virtually identical
gene pool 4,000 years ago?
This pattern of disease susceptibility suggests that Finns ancestral
gene pool was
small and was cut off early on
from the rest of Europes.
We could get radiation - resistance
genes, for example,
from the Bdelloid rotifer, a class of
small invertebrates that live in freshwater
pools and survive megadoses of ionizing radiation.
L. lugubris also has a
small gene pool: its population consists of clones descended
from four or five interspecies couplings.
The conclusions
from the seminar were (a) don't throw out the COMMD1 test and (b) as a numerically
small breed we can not afford to restrict the
gene pool.
Many result
from small show - circuit
gene pools so the health of the parents is doubly important.
(All responsible breeders carefully place their dogs in new homes, but breeders of rare breeds are even more finicky about where their pups go because they are guardians of a
small gene pool and need to make sure that all breedable dogs are kept intact and that buyers understand the consequences of owning a pet that is also the repository of
genes from that limited
pool.)
The gradual loss of alleles
from populations is known as «genetic drift», this is a random process which occurs naturally in all populations; it may not matter much in the large
gene pool of a large population, but becomes increasingly serious over time in the
small gene pools of
smaller populations.
Pocket Beagles are either selectively bred
from purebred Beagles that are exceptionally
small (which is not recommended because
smaller size is frequently associated with more health problems), or they are the result of mix breeding Beagles to other
small breeds such as Chihuahuas or Dachshunds (which is not recommended because you are introducing unpredictable temperament and health conditions
from those breeds, into the Beagle
gene pool).