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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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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 18, Problem 2SQ
Textbook Problem
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Which of the following assumptions is not part of cladistics?

  1. a. A lineage's characters change over time.
  2. b. All species share common ancestry.
  3. c. Each lineage branches from another lineage.
  4. d. Similar body parts are evidence of a recent divergence.

Summary Introduction

Concept introduction: In biological classification, cladistics is an approach in which organisms are categorized based on the most recent common ancestors. The outcome of cladistic method would be the pictorial representation of the obtained data in the form of a cladogram.

Explanation of Solution

Reason for correct answer: Cladistics made an approach to categorize organisms based on the ancestry shared by them. It allows the fact that a lineage’s characters may change over time and each lineage branches from another lineage. The concept that the similarity of body parts among different group of animals is an evidence for recent divergence is not a part of cladistics

Option d. is given as “similar body parts are evidence of a recent divergence”.

The presence of similar body parts cannot be considered as an indication for recent divergence. Hence, option d. is the correct answer.

Reason for incorrect answers:

Option a. is given as “a lineage’s character changes over time”...

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