Concept
Horizontal gene transfer
Gene sharing between cells, not offspring
hor-ih-ZON-tul jeen TRANS-fer
High-yield clue
The three routes of horizontal gene transfer are transformation, transduction, and conjugation.
Overview
The movement of genetic material between organisms other than by vertical parent-to-offspring inheritance, occurring by transformation, transduction, or conjugation. It is the central concept for the rapid spread of antibiotic resistance.
Classification
- Non-vertical gene movement
- Transformation route
- Transduction route
- Conjugation route
Lab & identification clues
- Mobile-genetic-element vocabulary
- Recombination-into-recipient concept
- Resistance-gene dissemination vocabulary
Associations
- Rapid antibiotic-resistance spread
- Bacterial genome plasticity
- Cross-species gene sharing
Commonly confused with
- Vertical inheritance
- Spontaneous mutation
Your notes
Original microbiology concept summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC/WHO topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment selection, infection-control instructions, or specimen-handling guidance.