If the two sister species on the phylogenetic tree shown differ from the other two species in a single character state (e.g., dark or light fur), how many character state changes (evolutionary events) are needed to explain this pattern?
A) one
B) two
C) three
D) four

Question

If the two sister species on the phylogenetic tree shown differ from the other two species in a single character state (e.g., dark or light fur), how many character state changes (evolutionary events) are needed to explain this pattern? 
A) one 
B) two 
C) three 
D) four

Quizplus · Accepted Answer

Only one evolutionary event (change in fur color) occurred in the lineage leading to the two sister species.

If the Two Sister Species on the Phylogenetic Tree Shown