alt Hacker News23andMe and similar companies don't transcribe your entire genome because that would cost way more than they charge you. They just sample a few tiny sections of it.
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iooi • yesterday at 7:52 PM
fwiw sequencing your entire genome only costs $400 or so from providers like sequencing.com
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A few as in tens of thousands.
23andMe used a custom Illumina Infinium microarray designed around segments of particular interest.
https://www.illumina.com/products/by-brand/infinium.html