Fred Griffith showed that a 'transforming principle' from heat-killed smooth pneumococci could change live rough cells in mice — history, not a protocol. Lederberg and Tatum showed E. coli can exchange genes by direct contact — conjugation in the textbook sense.
That is why resistance genes can jump species in hospitals and farms. The public story is traffic, not a construction kit. Biology here is a map of vehicles. A cell may take up loose DNA, dock with another cell, or receive a phage that packed the wrong genome.
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All points done. Next: Open the topic: Horizontal gene transfer
Fred Griffith showed that a 'transforming principle' from heat-killed smooth pneumococci could change live rough cells in mice — history, not a protocol. Lederberg and Tatum showed E. coli can exchange genes by direct contact — conjugation in the textbook sense.
That is why resistance genes can jump species in hospitals and farms. The public story is traffic, not a construction kit. Biology here is a map of vehicles. A cell may take up loose DNA, dock with another cell, or receive a phage that packed the wrong genome.
When news cites NDM or an ESBL, it is often naming luggage, not a new species invented overnight. Metagenomics sees resistance genes without always knowing which cell holds them. Linking gene to host is still hard.
Researchers ask how often HGT invents new metabolism in the wild versus merely moving known cassettes. Identity is genealogical: a tree of cells can be a web of genes. 16S might say one species while a plasmid says another neighborhood.
This is education from the atlas. It does not diagnose and does not prescribe a dose. It does not replace the full topic page.
Next question: Hygiene and balance · Open the topic: Horizontal gene transfer
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