Biology / Unit 8 Bio 1825 short lesson, about 20 seconds
The Web and Ring Models of Life
Captions available
The idea
Because gene transfer moves genes outside any single lineage, some propose a web or ring model instead of a rooted tree, per Bio 1791.
In practice
A web model connects branches wherever gene transfer occurred; a ring model proposes all three domains arose from one gene-swapping pool.
Where people slip
The tree, web, and ring models are competing proposals, not a settled replacement — phylogeneticists remain divided.
Your place on the trail
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Unlocks
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