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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 18, Problem 5SQ
Textbook Problem
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In a cladogram, each node represents a(n) _______ .

  1. a. single lineage
  2. b. extinction
  3. c. common ancestor
  4. d. adaptive radiation

Summary Introduction

Concept introduction: A cladogram is a diagrammatical representation of hypothetical relationship between different groups of animals. It is a systematic way used in evolutionary studies to find the relationship between various groups. It contains organisms being studied, lines, and nodes where those lines cross.

Explanation of Solution

Reason for correct answer: A node corresponds to a hypothetical ancestor. At each node, a splitting event occurs. The node therefore represents the end of the ancestral taxon, and the stems represent the species that split from the ancestor. The two taxa that split from the node are called sister taxa.

Option c. is given as “common ancestor”. Nodes in a cladogram usually represent a common ancestor.

Therefore, option c. is the correct answer.

Reason for incorrect answer:

Option a. is given as “single lineage”. It is the temporal series of organisms connected by a continuous line of descent from an ancestor to a descendent...

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