Biology / Unit 10 Bio 2231 short lesson, about 20 seconds
Animal Phylogeny as Evidence-Based and Revisable
Captions available
The idea
The animal phylogenetic tree, per Bio 1787 and Bio 0076, is built from morphological, developmental, and molecular evidence together, and shifts as new evidence arrives.
In practice
Molecular sequence data has repositioned several animal lineages relative to earlier trees built from body-plan comparisons alone.
Where people slip
A textbook animal tree states the current best-supported hypothesis, not a discovered, unchanging fact about ancestry.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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