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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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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 18, Problem 9SQ
Textbook Problem
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Homologous structures among major groups of organisms may differ in _______ .

  1. a. size
  2. b. shape
  3. c. function
  4. d. all of the above

Summary Introduction

Concept introduction: Homologous structures are the body structures with anatomical commonalities that are used for different purposes by different group of animals but have evolved from the same gene. It demonstrates the presence of a common ancestor. An example of homologous organs is the forelimbs of tetrapods.

Explanation of Solution

Reason for correct answer: The structures derived from a common ancestor (that may or may not be used for the same or different functions in the organism in which it occur) are known as homologous structures. It can differ in size, function, and shape among major group of organisms.

Option d. is given as “all of the above”. Homologous structures among major groups of organisms may differ in size, shape, and function. Therefore, option d. is the correct answer.

Reasons for incorrect answer:

Option a. is given as “size”. The homologous structures among different groups of organisms may differ not only in size, but also in shape and function...

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