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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 6SQ
Textbook Problem
6 views

Constructing a cladogram _______ .

  1. a. may involve parsimony analysis
  2. b. helps us rank species into taxa
  3. c. reveals convergent structures
  4. d. is a necessary part of DNA barcoding

Summary Introduction

Concept introduction: Cladogram is a pictorial representation used in the evolutionary studies that relate many animal groups according to their common ancestory. It is composed of the animal group being studied, lines, and nodal region, where those lines cross. Construction of a cladogram involves parsimony analysis. It provides one way of choosing among other phylogenetic hypothesis.

Explanation of Solution

Reason for correct answer:  Parsimony analysis works by determining the fit of each character on a given cladogram. It helps to find how and where changes have occurred in the tree. In phylogenetics, maximum parsimony is an optimality criterion under which the phylogenetic tree that minimizes the total number of character-state changes is to be preferred. Hence, parsimony analysis in cladogram helps to reduce the tree length.

Option a. is given as “may involve parsimony analysis”. Constructing a cladogram always involves parsimony analysis.

Therefore, option a. is the correct answer.

Reasons for incorrect answers:

Option b. is given as “helps us rank species into taxa”. Taxonomic rank is the relative level of a group of animals in the taxonomic hierarchy. A cladogram is used for identifying the relative similarity and to compare various groups of animals based on their ancestral history...

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