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In the late 1800s, a biologist studying animal embryos coined the phrase "ontogeny recapitulates phylogeny," meaning that the physical development of an animal embryo (ontogeny) seemed to retrace the changing form or the species during its evolutionary history (phylogeny). Why would embryonic development retrace evolutionary steps?

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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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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 18, Problem 1CT
Textbook Problem
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In the late 1800s, a biologist studying animal embryos coined the phrase "ontogeny recapitulates phylogeny," meaning that the physical development of an animal embryo (ontogeny) seemed to retrace the changing form or the species during its evolutionary history (phylogeny). Why would embryonic development retrace evolutionary steps?

Chapter 18, Problem 1CT, In the late 1800s, a biologist studying animal embryos coined the phrase "ontogeny recapitulates

Summary Introduction

To explain: Why embryonic development retraces evolutionary steps.

Concept introduction: “Ontogeny recapitulates phylogeny” is a popular phrase coined by Ernst Haeckel during the period of 19th century. It means that the embryonic development of an organism follows all the intermediate forms of its ancestors throughout the course of evolution. The concept is primarily concerned with the changes that an embryo undergoes during the period of development.

Explanation of Solution

The embryonic developmental stages of organisms reveal the path through which their ancestors had come. There are several significant similarities depicted in the embryo during its development. This extreme similarity might be due to the close similarity of their genes controlling development of the body plan...

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