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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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During the fetal period, ____________.

  1. a. gastrulation ends
  2. b. somites form
  3. c. a tail forms
  4. d. limb movements begin

Summary Introduction

Concept introduction: The blastocyst implants in the uterus and gastrulation takes place. After the gastrula is formed, organogenesis begins following the morphogenetic movements. The developing embryo is called as the fetus once the organogenesis ends.

Explanation

Reasons for the correct statement:

By the end of the 4th week, the limb buds and tail are formed. At the end of the 8th week, the embryo loses its tail and the pharyngeal arches will later give rise to the structures of the head and neck. The embryo development changes to the fetal development. The organs start to mature and the fetus drastically increases in size. The limbs develop, they start to move, and also increase in size.

Option d. is given as “gastrulation ends”.

As limb movements begin during fetal development, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “gastrulation ends”...

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