Classification and Cladistics [IB Biology HL]

Scientists classify organisms to organize species, communicate findings, and reveal evolutionary relationships. The video explains how classification has shifted from Linnaean morphology to molecular evidence using DNA, RNA, and proteins. It introduces cladistics and shows how to interpret cladograms to identify shared ancestry and derived traits. Molecular data can even lead to major reclassifications, as demonstrated with the figwort family. 0:00 - Why we classify 1:34 - Linnean classification 3:54 - Molecular evidence 6:06 - Introduction to cladistics 8:03 - Analysing cladograms 14:15 - Figwort reclassification 15:35 - Summary More IB Biology Videos & Exam Questions can be found at: Revision Village - IB Biology https://www.revisionvillage.com