The diagram shows three beetle species that are thought to have evolved from a recent common ancestor. Part 1 of the diagram shows three hypothesized phylogenetic trees for the three beetles. Part 2 compares a section of the ancestral species DNA to the corresponding sequences of the beetle species. Parts 3 and 4 shows the genetic mutations that must have occurred in each of the three phylogenetic trees. The resulting phylogenetic trees are shown below
Technique
11
- 1/(xT(x))
-^ h + Box^ h - m
events
Results
T
C
C
T
Species III
Species 11
Three phylogenetic hypotheses:
C
Species 1
0
3/A
A
40
4C
2/T AC
Site
123
Species i c
Species II
CT
Species III
Ancestral sequence A
A
T
A
Use the diagram to answer the question.
These beetle species are ecdysozoans. Nematodes are also ecdysozoans. Which characteristic makes these beetles more closely related to each other than to nematodes?
(1 point)
The beetles have an external cuticle, and nematodes do not
The beetles have jointed appendages, and nematodes do not
The beetles have a complete digestive system, and nematodes do not