This textbook is available Logo
Evolution 2nd Edition

Evolution (2nd Edition)

Book Edition2nd Edition
Author(s)Bergstrom, Dugatkin
PublisherW. W. Norton
Section 14.1: The Species Problem
Section 14.2: Modes of Speciation

Chapter 14, Section 14.1, KEY CONCEPT QUESTION, Exercise 14.1

Page 489


The evolutionary species concept is defined as species that has a single lineage of ancestor-dependent population of organisms. Purebreds that are controlled or bred by humans will maintain their unique identity from other animal D breeds and will have their own evolutionary tendencies and historical fate. Purebreds will have a shared future only if they have a shared ancestry.


On the contrary, if there is no control of the breeding activity, then each breed may follow a diverse evolutionary path. If humans continue to breed them in future, then each breed shall have a unique evolutionary path that they will follow and they shall have a unique entity in the evolutionary species concept. If humans stop controlling the breeding activity in these breeds, then each breed will probably not have a distinctive evolutionary future as they might interbreed.

Sample Response

From the evolutionary point of view, purebreds will have different fates depending upon their lineage and their history of being bred under the control of humans. If the breeding is controlled for a longer period, then different species are likely to have different evolutionary future. However, if the breeding is not controlled, then the animals D are likely to have the same evolutionary future.

How would you rate this answer and explanation?
Did you like this example?
Subscribe for full access
Page 489