In genetics, the simultaneous transfer of two or more genes from one bacterium to another during transduction (when viruses carry bacterial DNA).
From prefix 'co-' (together) + 'transduction' (transfer of genetic material). The term combines Latin 'co-' with scientific terminology developed in the 20th century.
Cotransduction taught scientists that genes don't travel alone—they travel in clusters on DNA, which is why genes located close together on a chromosome get inherited together, revealing the physical organization of genetic material.
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