Each branch point on a phylogenetic tree represents...Question 1Answera.The direct ancestor with different derived characteristics as the two lineages diverging from itb.A common ancestor of the two lineages diverging from itc.Always an extinct ancestor of the two lineages diverging from itd.Definitive proof that the two lineages diverging from it are related
Question
Each branch point on a phylogenetic tree represents...Question 1Answera.The direct ancestor with different derived characteristics as the two lineages diverging from itb.A common ancestor of the two lineages diverging from itc.Always an extinct ancestor of the two lineages diverging from itd.Definitive proof that the two lineages diverging from it are related
Solution
The correct answer is b. A common ancestor of the two lineages diverging from it.
Here's why:
A phylogenetic tree, also known as a tree of life, is a diagram that depicts the lines of evolutionary descent of different species, organisms, or genes from a common ancestor.
Each branch point, or node, on the tree represents a common ancestor from which the species diverged. This means that at each branch point, the species share a common ancestor, but then evolve and diverge into separate lineages.
So, each branch point does not necessarily represent a direct ancestor with different derived characteristics as the two lineages diverging from it (option a), nor does it always represent an extinct ancestor of the two lineages diverging from it (option c).
And while the branch point does indicate a relationship between the two lineages diverging from it, it is not definitive proof of that relationship (option d). The relationship is inferred based on the best scientific evidence available, but like all scientific inferences, it is subject to revision in light of new evidence.
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