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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 25, Problem 3SQ
Textbook Problem
11 views

Vertebrate jaw banes evolved from ___ .

  1. a. gill supports
  2. b. ribs
  3. c. scales
  4. d. ear banes

Summary Introduction

Concept introduction: Gastrula during embryonic development has three layers: ectoderm, mesoderm, and endoderm. Each germ layer gives rise to different sets of organs. The vertebrates are chordates that are characterized by the presence of a strong vertebral column.

Explanation of Solution

Reasons for the correct statement:

The vertebrates with the jaw bones are known as jawed vertebrates. The jaw bones evolved from the gill arches and are derived from the mesoderm. The gill arches also known as gill supports are the skeletal structures that support the gills of aquatic vertebrates.

Option a. is given as “gill supports”

Since gill arches give rise to vertebrate jaw bones, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “ribs”.

The ribs are skeletal structures that support the lungs, and they evolved from somites...

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