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Darwin Presents His Case . Section 15-3 This section explains the concepts of artificial selection, natural selection, and fitness. It also describes evidence for evolution. Publication of On the Origin of Species. Is the following sentence true or false?

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darwin presents his case

Darwin Presents His Case

Section 15-3

This section explains the concepts of artificial selection, natural selection, and fitness. It also describes evidence for evolution.

publication of on the origin of species
Publication of On the Origin of Species

Is the following sentence true or false?

  • When Darwin returned to England, he rushed to publish his thoughts about evolution.
  • False
publication of on the origin of species1
Publication of On the Origin of Species

The naturalist whose essay gave Darwin an incentive to publish his own work was.

  • Alfred Russel Wallace
publication of on the origin of species2
Publication of On the Origin of Species
  • Circle the letter of each sentence that is true about Darwin’s book, On the Originof Species.
  • It contained evidence for evolution.
  • It described natural selection.
inherited variation and artificial selection
Inherited Variation and Artificial Selection
  • Differences among individuals of a species are referred to as __________.
  • variation
inherited variation and artificial selection1
Inherited Variation and Artificial Selection

Is the following sentence true or false?

Genetic variation is found only in wild organisms in nature.

false

inherited variation and artificial selection2
Inherited Variation and Artificial Selection

Circle the letter of each sentence that is true about artificial selection.

  • It is also called selective breeding.
  • It occurs when humans select natural variations they find useful.
  • It produces organisms that look very different from their ancestors.
evolution by natural selection
Evolution by Natural Selection

What was Darwin’s greatest contribution?

  • His greatest contribution was developing a scientific hypothesis to explain how evolution occurs.
evolution by natural selection1
Evolution by Natural Selection

What does the phrase struggle for existence mean?

  • It means that members of each species compete regularly to obtain food, living space, and other necessities of life.
evolution by natural selection2
Evolution by Natural Selection
  • Fitness - The ability of an individual to survive and reproduce in its specific environment
  • Adaptation - Any inherited characteristic that increases an organism’s chance of survival
  • Natural selection - Survival of the fittest
darwin s theory of evolution
Darwin’s Theory of Evolution

Is the following sentence true or false?

  • Adaptations can be physical characteristics but not more complex features such as behavior.
  • False
darwin s theory of evolution1
Darwin’s Theory of Evolution

Explain what Darwin meant by the phrase survival of the fittest.

Individuals that are better suited to their environment survive and reproduce most successfully.

darwin s theory of evolution2
Darwin’s Theory of Evolution

Circle the letter of each sentence that is true about natural selection.

  • It selects traits that increase fitness.
  • It takes place without human control.
darwin s theory of evolution3
Darwin’s Theory of Evolution
  • The principle that living species descend, with changes, from other species over time is referred to as_______ .
  • Descent with modification
darwin s theory of evolution4
Darwin’s Theory of Evolution
  • The principle that all species were derived from common ancestors is known as________.
  • Common Descent
evidence of evolution
Evidence of Evolution

Is the following sentence true or false?

  • Darwin argued that living things have beenevolving on Earth for thousands of years.
  • false
slide18
How do fossils that formed in different rock layers provide evidence of evolution?
  • They document the fact that life on Earth has changed over time.
slide19
Circle the letter of the way Darwin explained the distribution of finch species on the Galápagos Islands.
  • They had descended with modification from a common mainland ancestor.
slide20
How did Darwin explain the existence of similar but unrelated species?
  • Darwin thought that such species evolved features in common because they were exposed to similar pressures of natural selection.
slide21
Structures that have different mature forms but develop from the same embryonic tissues are called .
  • HOMOLOGOUS STRUCTURES
slide22
Is the following sentence true or false?
  • Homologous structures provide strong evidence that all four-limbed vertebrates have descended, with modifications, from common ancestors.
  • TRUE
slide23
Organs that are so reduced in size that they are just vestiges, or traces, of homologous organs in other species are called .
  • VESTIGAL ORGANS
summary of darwin s theory
Summary of Darwin’s Theory
  • Circle the letter of each idea that is part of Darwin’s theory of evolution.
  • There is variation in nature.
  • Fewer organisms are produced than can survive.
  • Species change over time.
summary of darwin s theory1
Summary of Darwin’s Theory

According to Darwin’s theory, what happens to individuals whose characteristics are not well suited to their environment?

  • Such individuals die or leave fewer offspring.
summary of darwin s theory2
Summary of Darwin’s Theory

Darwin believed that all organisms on Earth are united into a single tree of life by

  • Descent with modification
evolutionary theory since darwin
Evolutionary Theory Since Darwin

What is the status of Darwin’s hypotheses today?

  • They have been confirmed andexpanded by scientific advances in biology, geology, and physics