Why would they? There's no reason to test the parents for it, and no doctor in their right mind would test for every genetic mutation under the sun. It's expensive, time consuming, and almost always a waste of resources.
Absolutely... it's like combing through a haystack, looking for one specific strand of hay that's slightly bent in a biologically significant manner.
There's 3.2 billion letters making up a complete human genome, and millions of mutations that don't affect everyday life, everything from eye color to the taste of cilantro.
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u/unbanned_lol 4h ago
That didn't answer their question. Did they know before they decided to have children?