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every time there is a change you have a branch
But how can i explain this by writing it out... @phi and @aaronq
The 3 changes mean 3 "bifurcations" (branches) in the tree from their last common ancestor
yeah you could argue that the 3 changes in amino acids happened 3 splits/branches from the ancestor (one every split), or you could argue that they all happened at once, regardless, it doesn't tell you the similarities between the common ancestor and the descendants, so you don't know if one's hemoglobin mutated and the other didn't. But they would still be branching off the common ancestor. So to summarize node common ancestor (node), descendants (tips of branches).|dw:1360181281410:dw|