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Biology: The Unity and Diversity o...

14th Edition
Cecie Starr + 3 others
ISBN: 9781305073951

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

14th Edition
Cecie Starr + 3 others
ISBN: 9781305073951
Textbook Problem

A clade is _________.

  1. a. defined by a derived trait
  2. b. a monophyletic group
  3. c. a hypothesis
  4. d. all of the above

Summary Introduction

Concept introduction: A clade is a monophyletic group that consists of an ancestor in which a derived character is evolved together with all of its descendants. The common ancestor may be a species, a population, an individual, and so on, up to a kingdom. Making hypothesis about the evolutionary history of a group of clades is called cladistics.

Explanation

Reasons for the correct answer:

A clade is a monophyletic group that only contains all the descendants of a common ancestor. The original population and all its descendants are a clade, where they all follow a derived character. In fact, the term clade is a hypothesis that relates different group of organisms with derived characters.

Option d. is given as “clade”. A clade is a hypothetical concept of a monophyletic group with several derived characters. Therefore, option d. is the correct answer.

Reasons for the incorrect answers:

Option a. is given as “defined by a derived trait”. A clade is a hypothesis that comprises a monophyletic group with a derived trait...

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