It can go either way depending on the animals used.
Lets say:
2 animals that have no negative genes or traits are bred together. Since they have no deleterious alleles, that means they can only produce healthy offspring that do not contain those bad genes.
And as Ohhwataloser said, it could strengthen the line.
In contrast, 2 animals that have deletrious alleles could produce offspring that possess more of those deleterious alleles.
People are always saying how mutt dogs are healthier than purebreds. False. Mutts are not always more healthy. (American Bully anyone?)
If those mix dogs inherited the poor traits of their parents, they could also be just as bad as other genetic train wrecks. For example, a mutt that has English Bulldog blood could possess the same breathing issues as their purebred counterparts.
Offspring health can go either way depending on the health and genetics of the breeding animals.
And the thing about inbreeding, you're generally mixing together a similar set of genes. So you have a greater chance of exposing a specific gene; good or bad.
Something that usually promotes defects, weakness, or less than quality of life.
Spinal kinks for example.










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