Answer the questions based on the following phylogenetic...

Answer the questions based on the following phylogenetic tree:
a. Which node is the common ancestor of species E and B?
b. Which species is most similar to the original common ancestor for species $A-E$ ?

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Key Concepts

Phylogenetic Trees

Phylogenetic trees are diagrams that represent evolutionary relationships among species or other taxa. They depict how groups of organisms are related through common ancestry by showing branch points (nodes) that represent divergence events from an ancestral lineage.

Common Ancestor

A common ancestor is an ancestral species or node from which two or more descendant species have evolved. In phylogenetic trees, identifying the common ancestor involves locating the shared node from which the branches of the compared species emerge.

Most Recent Common Ancestor (MRCA)

The most recent common ancestor (MRCA) is the last common node from which a set of species directly descend. Determining the MRCA helps in understanding the relative evolutionary closeness of species, as those sharing a more recent ancestor are typically more alike than those whose shared ancestor lies further back in time.

Tree Topology and Evolutionary Relatedness

Tree topology refers to the structure or layout of the branches and nodes in a phylogenetic tree, which is key to interpreting the evolutionary relationships among species. By analyzing the position and connectivity of nodes and branches, one can infer which species are more similar to each other and how traits have evolved over time.

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