how do endangered species deal with inbreeding?
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They generally don’t. It’s basically luck whether the inbreeding harms them or not. Some species have bounced back from extremely small numbers with no discernable detrimental impact on their genetics, while others are more noticeably suffering effects from inbreeding. Generally though, if the inbreeding is severe and long-term enough, it will almost always cause harmful effects for the species. Human conservationists can intervene to some extent, by tracking the genetics in a population and encouraging certain breeding pairs to maximize genetic diversity, or by (usually as a last resort) hybridizing the species with another.
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