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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 25, Problem 5SQ
Textbook Problem
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Tetra pods evolved from ___ .

  1. a. sharks
  2. b. teleosts
  3. c. lobe-finned fishes
  4. d. placoderms

Summary Introduction

Concept introduction: Tetrapods are vertebrate chordates. Tetrapods are those chordates that have four limbs which help them in locomotion. Lobe-finned fish are those that have skeletal structures that support their fins anatomically.

Explanation of Solution

Reason for correct answer:

Tetrapods are the first proper land-dwellers or terrestrial animals. The lobe-finned fish include coelacanths and lungfishes. The lung fishes were able to survive on land for a minimal period with the help of their lungs. Genetic analysis, a part of molecular taxonomy and evolution, reveals that tetrapods and lungs fish have few common genome sequences. The amphibians are the first tetrapods that must have evolved from the lung fish. Therefore, it can be concluded that tetrapods evolved from an ancestral lungfish, and the lobed fins of the lung fish gave rise to fore limbs and hind limbs.

Option c. is given as “lobe-finned fishes” and since tetrapods evolved from the lungfishes that are classified under lobe-finned fishes, the correct answer is option c.

Reason for incorrect answer:

Option a...

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