"A clade is, simply expressed, any branch (Greek: klados) of the evolutionary tree which is separated from the rest of the tree by a single cut. Any branch, however large or small, that is cut off this way is monophyletic, or of a single origin. Monophyly is, under cladistic terminology, the property of a single species and all of its descendant species."
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This is the first in an irregular series of basic concepts in science, that I suggested to the Seed Bloggers we might do from time to time. If anyone wants to suggest a revision, because I got it wrong or am unclear, make a comment - this will be revised to make sure it is OK.
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