5) You are studying the evolution of a group of freshwater fish. They are repres

Question

5) You are studying the evolution of a group of freshwater fish. They are represented by species A-F, all of which are alive today. You have both DNA sequence data, providing you with information about the relationships among species, and fossil data, providing you with information about the approximate time of divergence (splitting) between different lineages. On the plot below, draw a chronogram that incorporates all of the following information

DNA data:

• B and C are each other's closest relatives

• A clade consisting of D and F is the sister group to A

• E is more closely related to B and C than it is to F

• A, D, and F form a clade

• The common ancestor of D and C represents the root of the tree

Fossil data: (mya = million years ago)

• The most recent common ancestor of C and E lived 20 mya

• The most recent common ancestor of A and B lived 30 mya

• The most recent common ancestor of B and C lived 5 mya

• The most recent common ancestor of D and F lived 10 mya

• The most recent common ancestor of A and D lived 25 mya

Explanation / Answer

In a chronogram certain letters represent a date or epoch.

A and B have the oldest ancestors, followed by D. This is followed by ancestors of E. Then comes F followed by C.

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