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Evolutionary relationships are pretty important in biology and thus constructing phylogenetic trees is becoming a part of practical exam in almost every biology olympiad. Below you will find some slideshows about UPGMA.

UPGMA is a distance method and therefore needs a distance matrix. UPGMA is “ultrametric”, meaning that all the terminal nodes (i.e. the sequences/taxa) are equally distance from the root. 

An amazing step-by-step tutorial how to use UPGMA can be found HERE, so study it thoroughly because you may need to construct a tree during the IBO using this UPGMA method. Thanks to

Then, a very handy tool to learn about evolution can be found HERE.