If you were presented with a phylogenetic tree, how would you go about identifying a clade on the tree? Make sure to use the terms “node” and “branch” in your answer. In most phylogenetic trees, is there a single clade (monophyletic group) or more than one? Explain.
Defend the claim that prokaryotes dominate most nutrient cycles on Earth.
Monophyletic group is the one which includes an ancestor and all of its descendants. We call it as a clade because all the descendants have been derived from the same common ancestor by showing different mutation or evolution of different characters.
The common ancestor in a monophyletic group is represented by a node and all the branches represent speciation event. The tips of all the branches represent descendants of the common ancestor.
It is not necessary that a phylogenetic tree will contain a single monophyletic group. There can be more than one monophyletic group and there are chances that the monophyletic groups are overlapping.
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