There are many genetic mutations that are harmful and cause complications if not death. Evolution is the long-term product of genetic adaptations, mutations and heritable traits that may make it easier for an organism to survive and reproduce, eventually this trait may become more common in the population. These adaptations might eventually become less useful for that and eventually become obsolete vestigial structures like the tailbone in humans.
This would be more of detrimental mutation caused by some missing or extra copy of a gene or an error in it.
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u/Lou_LL_11 29d ago
Genetic defect is just another word for evolution.