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The Process of Speciation . Section 16–3 This section explains how species evolve and describes the process of speciation in the Galápagos Islands. Introduction . What is speciation? It is the formation of new species. Isolating Mechanisms. The Process of Speciation.

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the process of speciation

The Process of Speciation

Section 16–3

This section explains how species evolve and describes the process of speciation in the Galápagos Islands.

introduction
Introduction
  • What is speciation?
  • It is the formation of new species.
  • Isolating Mechanisms
the process of speciation3
The Process of Speciation
  • Is the following sentence true or false?
  • Individuals in different species can have the same gene pool.
  • False
the process of speciation4
The Process of Speciation
  • What does it mean for two species to be reproductively isolated from each other?
  • Members of the two species cannot interbreed and produce fertile offspring.
the process of speciation5
The Process of Speciation
  • What must happen in order for new species to evolve?
  • Populations must be reproductively isolated from each other.
the process of speciation6
The Process of Speciation
  • List three ways that reproductive isolation occurs.
  • Behavioral isolation
  • Temporal isolation
  • Geographic isolation
the process of speciation7
The Process of Speciation
  • When does behavioral isolation occur?
  • It occurs when populations are capable of interbreeding but have differences in courtship rituals or other types of behavior.
the process of speciation8
The Process of Speciation
  • Is the following sentence true or false?
  • Eastern and Western meadowlarks are an example of behavioral isolation.
  • True
the process of speciation9
The Process of Speciation
  • When does geographic isolation occur?
  • It occurs when populations are separated by geographic barriers such as rivers, mountains, or bodies of water.
the process of speciation10
The Process of Speciation
  • Abert and Kaibab squirrels in the Southwest are an example of_______ isolation.
  • geographic
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The Process of Speciation
  • Is the following sentence true or false?
  • Geographic barriers guarantee the formation of new species.
  • False
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The Process of Speciation
  • What is an example of temporal isolation?
  • Each of three similar species of orchid in the same rain forest releases pollen on different days.
testing natural selection in nature
Testing Natural Selection in Nature

Is the following sentence true or false?

The basic mechanisms of evolutionary change cannot be observed in nature.

false

testing natural selection in nature14
Testing Natural Selection in Nature
  • Circle the letter of each hypothesis about the evolution of Galápagos finches that was tested by the Grants.
  • The finches’ beak size and shape has enough inheritable variation to provide raw material for natural selection.
  • Differences in the finches’ beak size and shape produce differences in fitness that cause natural selection to occur.
complete the flowchart to show how speciation probably occurred in the gal pagos finches
Complete the flowchart to show how speciation probably occurred in the Galápagos finches.
testing natural selection in nature16
Testing Natural Selection in Nature

How could differences in beak size lead to reproductive isolation?

  • Birds with the same beak size prefer to mate with each other.
  • As a result, big-beaked and smaller-beaked birds would not choose to mate with each other, and their gene pools would remain isolated.
studying evolution since darwin
Studying Evolution Since Darwin
  • Why is the study of evolution important?
  • By understanding evolutionary theory, we can respond to changes in the living world in ways that improve human life.