Biology: The Unity and Diversity o...

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



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 17, Problem 5SQ
Textbook Problem

Which of the following is not part of how we define a species?

  1. a. Its individuals appear different from other species.
  2. b. It is reproductively isolated from other species.
  3. c. Its, populations can interbreed.
  4. d. Fertile offspring are produced.

Summary Introduction


Species can be defined as a group of related individuals that are able to interbreed within themselves. The organisms belonging to same species are involved in reproducing and increasing the population of their own species. Thereby, they produce fertile individuals that themselves are capable of rising fertile progenies. But when the individuals of different species mate with each other or breed that will usually end in reproducing infertile young ones.

Explanation of Solution

Reasons for the correct statement:

Organisms are classified as species on the basis of their reproducing compatibility not by their appearance. It is not necessary that the individuals of the same species must appear the same as other species. Same species are physically different from each other. For example, dogs belonging to the same species such as Siberian husky and German shepherd appear different, but they can cross breed to produce fertile young ones. Therefore, this is not the way how we can define a species.

Option a. is given as “Its individuals appear different from other species.”

Even though the organisms belong to the same species but looks different from each other, so we cannot define a species that its individuals from a species look different from the individual of another species, as it is appears different from the member of the same species.

Therefore, the given statement is incorrect. Hence, option a. is correct...

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