To conduct a phylogenetic analysis, an outgroup is needed in order to:
A)decide which characters are analogous and which are homologous.
B)determine which character states are ancestral and which are derived.
C)determine which characteristics to include in our analysis.
D)decide which molecular data to use.
E)All of these choices are correct.

Question

Quizplus · Accepted Answer

The outgroup is needed to determine which character states are ancestral and which are derived. This is important in constructing a phylogenetic tree, as it allows for the determination of which traits evolved in the lineage leading to the group of interest. The other options may be important in conducting a phylogenetic analysis, but the primary purpose of the outgroup is to distinguish ancestral from derived characteristics.

To Conduct a Phylogenetic Analysis, an Outgroup Is Needed in Order