Download Development of Theory of evolution

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Introduction to evolution wikipedia, lookup

Theistic evolution wikipedia, lookup

Catholic Church and evolution wikipedia, lookup

Saltation (biology) wikipedia, lookup

Hindu views on evolution wikipedia, lookup

Hologenome theory of evolution wikipedia, lookup

Unilineal evolution wikipedia, lookup

Natural selection wikipedia, lookup

Sociocultural evolution wikipedia, lookup

Koinophilia wikipedia, lookup

Transitional fossil wikipedia, lookup

Objections to evolution wikipedia, lookup

On the Origin of Species wikipedia, lookup

Unit 2: Evolution
Learning Goal 1:
Examine the history of
the development of the
theory of evolution.
Scientific Theory
A well supported testable explanation of
phenomena that have occurred in the natural
Charles Darwin (1809-1882)
First attended the University of Edinburgh to become
a surgeon.
Transferred to Cambridge to study theology and
become an Anglican priest.
Graduated at the age of 22 (1831) and joined the
HMS Beagle.
Father did not want him to join the ship because it might
lead him away from a future in the clergy.
Started as the captains companion and later became the
ship’s naturalist.
Five-Year Voyage
HMS Beagle
Used by permission of Darwin Day
Celebration (at, 2006
I have called this principle, by which
each slight variation, if useful, is preserved,
by the term Natural Selection.
—Charles Darwin from "The Origin of Species"
Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College.
Darwin’s Observations
Patterns of Diversity
Darwin observed similar animals that were
diverse in their characteristics.
Darwin’s Observations
a large part of the puzzle.
A fossil is preserved remains
of ancient organisms.
Many animals found in
fossils were very similar to
modern day organisms.
Galapagos Islands
Darwin observed that the characteristics of
many plants and animals varied noticeably
among the different islands.
Galapagos Islands
Each island had a very different climate.
The smallest, lowest islands were hot, dry, and
nearly barren.
Sparse vegetation
Higher islands had greater rainfall.
Different assortment of plants and animals.
Island Tortoises
Darwin found that the shape of the shell of
the tortoise varied from island to island.
You could use the shape of the shell to determine
where the tortoise had come form.
Galapagos Iguanas
Galapagos Iguanas
The iguanas seemed to adapt to their
Those that lived near trees had feet and
claws adapted for climbing in soft tissue.
Those that lived on rocky cliffs had feet and
claws adapted to climbing on rocky cliffs.
Darwin’s Finches
Darwin found finches around the islands that
had beak types that were specific to the
types of food available.
*Those with big thick beaks ate seeds
were available.
*Those with smaller beaks ate the
flesh of fruit or insects.
Darwin’s Finches
Origin of Evolutionary Thought
Charles Darwin developed the central
idea of evolution by natural selection,
but others before and during his time
also built essential parts of the theory.
James Hutton
Proposes that Earth is shaped by forces
that took place over extremely long periods
of time.
Proposed Earth to be millions of years old.
Thomas Malthus
Human populations will grow
faster than the space and
food supplies needed to
sustain it.
– Competition
Jean-Baptiste Lamarck
Publishes his hypothesis of
the inheritance of acquired
Ideas were flawed.
The first to propose a
mechanism explaining
how organisms change
over time.
Charles Lyell
Publishes Principles
of Geology
Explains that processes
occurring now have
shaped Earth’s geological
features over long
periods of time.
Alfred Wallace
Independently drew the same
conclusion as Darwin.
Evolution by Natural Selection
Conferred with Darwin about
On the Origin of Species
Published in 1859
Proposed a mechanism
for evolution called Natural Selection
Organisms changed over time as a result of
the change to their environment.
Those best suited for their
environment would survive
and pass on their traits.