Inbreeding is used by breeders of domestic animals to fix desirable genetic traits within a population or to attempt to remove deleterious traits by allowing them to manifest phenotypically from the genotypes. Breeders must cull unfit breeding suppressed individuals and/or individuals who demonstrate either homozygosity or heterozygosity for genetic based diseases.
Yes. Scientists have observed inbreeding in animal species in the wild. This has been observed in mammal, insect and bird species. The effects of inbreeding are quite negative for the animals that engage in it (poor health of newborns, low survival rates) so it is not often observed (and thus it has been difficult to demonstrate the negative effects) in the wild, but it has been done.
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