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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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The outermost germ layer in a vertebrate gastrula is the ________.

  1. a. endoderm
  2. b. ectoderm
  3. c. mesoderm
  4. d. dermis

Summary Introduction

Concept Introduction The gametes unite to form the zygote. The zygote undergoes cleavage to form the blastula. The blastula develops into gastrula. The gastrula undergoes organogenesis to form the fetus.

Explanation

Reasons for the correct statement:

The blastula undergoes gastrulation to form the gastrula. The gastrula is made of three layers called germ layers. From these germ layers, the organs are developed by the regulated gene expression. The outermost germ layer is called ectoderm. The ectoderm gives rise to skin and the nervous system.

Option b. is given as “ectoderm”

As ectoderm constitutes the outer most germ layer of gastrula, option b. is correct.

Reasons for the incorrect statements:

Option a...

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