The Development of Evolutionary Theory - PowerPoint PPT Presentation

Loading...

PPT – The Development of Evolutionary Theory PowerPoint presentation | free to download - id: 6e4901-ZTIxM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

The Development of Evolutionary Theory

Description:

Title: Chapter 2 the Development of Evolutionary Theory Author: stacy Last modified by: Foothill College Created Date: 11/6/2000 4:19:24 PM Document presentation format – PowerPoint PPT presentation

Number of Views:23
Avg rating:3.0/5.0
Slides: 15
Provided by: Stacy113
Learn more at: http://www.foothill.edu
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: The Development of Evolutionary Theory


1
Chapter 2
  • The Development of Evolutionary Theory

2
Evolution?
  • Brian Malow http//www.youtube.com/watch?vOhvh47v
    Tp34featurerelated

3
Introduction to the Subject of Evolution
  • Evolution is the most fundamental of all
    biological processes, but one of the most
    misunderstood.
  • Humans evolved from a species that lived some
    6-8 million years ago (mya), not monkeys or
    chimpanzees.

4
  • Evolution takes time hence, the appearance of a
    new species is rarely witnessed
    (microevolutionary changes occur, however see
    Chapt. 1)
  • The subject of evolution is controversial,
    especially in the U.S. because of conflicting
    spiritual teachings

5
Evolution Is a Theory
  • The theory has been tested and subjected to
    verification through accumulated evidence (and
    has not been disproved)
  • The theory of evolution has been supported by a
    mounting body of genetic evidence.
  • The theory has stood the test of time.
  • The theory continues to grow.

6
A Brief History of Evolutionary Thought
  • Evolutionary principles were developed in western
    Europe, made possible by scientific thinking
    dating to the 16th century.
  • Western science, however, borrowed ideas from
    Arab, Indian, and Chinese cultures where notions
    of biological evolution had already developed.
  • It was the theory that was new.

7
Natural Selection
  • Natural selection in the theory of evolution
    refers to genetic change or changes in the
    frequencies of certain traits in populations due
    to differential reproductive success between
    individuals.
  • The most critical mechanism of evolutionary
    change, first explained by Charles Darwin
  • Same conclusions were independently reached by
    Alfred Russel Wallace.
  • A predominant feature of European worldview was,
    however, that all forms of nature never changed.

8
Fixity of Species
  • The notion that species, once created, can never
    change.
  • An idea opposed to theories of biological
    evolution.
  • To challenge the idea was to challenge the
    perfection of Gods design.

9
The Scientific Revolution
  • Came with the discovery of the New World,
    introducing new ideas and challenging fundamental
    views about the planet.
  • Exposure to new plants and animals increased
    awareness of biological diversity.

10
EVOLUTION THE INSPIRATIONS JOHN RAY 1627-1705
  • John Ray, a minister educated at Cambridge
    University, developed the concept of species.
  • He recognized that groups of plants and animals
    could be differentiated from other groups by
    their ability to mate with one another and
    produce offspring.
  • He placed such groups of reproductively isolated
    organisms into a single category, which he called
    the species.

11
EVOLUTION THE INSPIRATIONS CAROLUS LINNAEUS
1707-1778
  • Carolus Linnaeus, a Swedish naturalist who
    developed a method of classifying plants and
    animals.
  • In Systema Naturae, first published in 1735, he
    standardized Rays use of genus and species
    terminology and established the system of
    binomial nomenclature.
  • He added two more categories class and order.
  • Linnaeus four-level system became the basis for
    taxonomy.

12
EVOLUTION THE INSPIRATIONS CAROLUS LINNAEUS
1707-1778
13
EVOLUTION THE INSPIRATIONS ERASMUS DARWIN1731-1802
  • Erasmus Darwin, Charles Darwins grandfather
  • Physician, poet, and leading member of an
    intellectual community in England
  • In a poem, expressed the view that life had
    originated in the seas and all species descended
    from a common ancestor.
  • Charles read his grandfathers writings, but how
    much he was influenced by them is unknown.

14
EVOLUTION THE INSPIRATIONS JEAN-BAPTISTE LAMARCK
1744-1829
  • Jean-Baptiste Lamarck developed a theory to
    explain the evolutionary process, known as the
    inheritance of acquired characteristics.
  • An example is the giraffe having stripped the
    leaves from the lower branches of a tree, the
    animal tries to reach leaves on upper branches.
  • The neck becomes slightly longer.
  • The longer neck is passed on to offspring.

France
About PowerShow.com