Problem: The phylogenetic tree shown here displays the major clades of chordates. Which statements about the phylogenetic tree are true? Select All that Apply:a) Organism (c) is a common ancestor of lampreys and lungfishes.b) Birds and ray-finned fishes have a notochord and jaws.c) Lancelets and coelacanths are more closely related than are chimaeras and coelacanths.d) Mammals and turtles are more closely related than are lungfishes and sharks.e) Rays and frogs have vertebrae.f) Descendants of organism (d) have limbs with digits.g) Hagfishes, lungfishes, and frogs have lobed fins.h) Organism (a) is a common ancestor of all chordates.

FREE Expert Solution

a) Organism (c) is a common ancestor of lampreys and lungfishes. → FALSE

Organism (c) is an ancestor of lungfishes but not of lampreys.


b) Birds and ray-finned fishes have a notochord and jaws. → TRUE

Birds contain a notochord in their embryonic phase; this develops into the vertrebrae. Both birds and ray-finned fishes have mineralized jaws.

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Problem Details

The phylogenetic tree shown here displays the major clades of chordates. 

Which statements about the phylogenetic tree are true? Select All that Apply:

a) Organism (c) is a common ancestor of lampreys and lungfishes.

b) Birds and ray-finned fishes have a notochord and jaws.

c) Lancelets and coelacanths are more closely related than are chimaeras and coelacanths.

d) Mammals and turtles are more closely related than are lungfishes and sharks.

e) Rays and frogs have vertebrae.

f) Descendants of organism (d) have limbs with digits.

g) Hagfishes, lungfishes, and frogs have lobed fins.

h) Organism (a) is a common ancestor of all chordates.

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