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Evolution
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Survival of the Fittest

Key Concept

Over Time, Natural Selection Results In Changes In The Inherited Characteristics Of A Population. These Changes Increase A Species Fitness In Its Environment

Slide 68

Natural Selection

Natural Selection

Cannot Be Seen Directly

It Can Only Be Observed As Changes In A Population Over Many Successive Generations

Radiation

Fossil Record

Slide 69

Descent With Modification

Descent With Modification

Takes Place Over Long Periods of Time

Natural Selection Can Be Observed As Changes In

Body Structures

Ecological Niches

Habitats

Slide 70

Descent With Modification

Descent With Modification

Species Today Look Different From Their Ancestors

Each Living Species Has

Descended

With Changes

From Other Species

Over Time

Slide 71

Descent With Modification

Descent With Modification

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Descent With Modification

Descent With Modification

Implies

All Living Organisms Are Related

Single Tree of Life

DNA, Body Structures, Energy Sources

Common Descent

All Species, Living & Extinct, Were Derived From Common Ancestors

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Major Problem in Darwin’s Theory

No mechanism to explain natural selection

How could favorable variations be transmitted to later generations?

With the rediscovery of Mendel’s work in the first half of the 20th century, the missing link in evolutionary theory was found

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Opposition to Evolution

Opposition to Evolution

The upheaval surrounding evolution began with Darwin’s publication of On the Origin of Species By Means of Natural Selection

The debate continues nearly 150 years later

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Theory of Evolution Today

Theory of Evolution Today

Supporting Evidence

Slide 76

Homologous Structures

Homologous Structures

Slide 77

Evidence for Evolution - Comparative Embryology

Evidence for Evolution - Comparative Embryology

Similarities In Embryonic Development

Slide 78

Similarities in DNA Sequence

Similarities in DNA Sequence

Slide 79

Evolution of pesticide resistance in response to selection

Evolution of pesticide resistance in response to selection

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