In a nutshell, inbreeding increases the odds of rare genetic disorders because the more closely related two people are, the more likely it is that they’ll both be carriers of the same recessive genes, which gives these genes a chance of pairing up.
However, it’s important to note that even if both parents are carriers of disorder-linked recessive genes, odds are that their offspring will not develop the disorder. In other words, while inbreeding increases this risk, it’s not guaranteed.Emphasis ours. The fact is, most children born to close relatives are healthy. It's also important to remember that consanguinamory and inbreeding aren't the same thing, though inbreeding can result from consanguinamory.
Then the blog has a YouTube video from ASAP Science on the topic.
For more, please see our entry on Consanguinamory and Reproduction and this entry for consanguinamorists considering parenting.
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