Tag
#genomics
Every article tagged “genomics”.
2 articles
Biotechnology
A PCR test can call you positive weeks after you stopped being infectious. That is the test working correctly
PCR is a photocopier for one chosen stretch of DNA, and it doubles what it finds thirty times over. Almost everything people find confusing about the test — the lingering positives, the Ct number, the false negatives — is a direct consequence of that.
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Biotechnology
Nobody reads a genome from beginning to end — what a sequencing machine actually does
A sequencer does not run along a chromosome reading letters like a tape. It shreds the genome into millions of fragments, reads the pieces, and leaves a computer to work out the order. Almost everything confusing about genomics follows from that.
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