A) that these organisms are phenotypically more similar to each other than to any others shown on the trees in Figure 26.2.
B) that their morphological similarities are probably homoplasies.
C) that they had a common ancestor.
D) that all three of the responses are correct.
E) that two of the responses are correct.
Answer: C
-If cetaceans are determined to have diverged from the lineage leading to the artiodactyls before the divergence of lineages leading to the modern artiodactyls (including hippos), then the cetaceans can be considered
1)a sister order to the order Artiodactyla.
2)an ingroup of the order Artiodactyla.
3)the common ancestor of the order Artiodactyla.
A) 1 only
B) 3 only
C) 1 and 2
D) 1 and 3
E) 2 and 3

Question

Quizplus · Accepted Answer

1 onlyIf cetaceans diverged from the lineage leading to artiodactyls before the divergence of lineages leading to modern artiodactyls, they would be considered a sister group to the order Artiodactyla, not an ingroup or the common ancestor.

A) That These Organisms Are Phenotypically More Similar to Each