Charles Darwin and Natural Selection - PowerPoint PPT Presentation

1 / 20
About This Presentation
Title:

Charles Darwin and Natural Selection

Description:

Charles Darwin and Natural Selection Objectives: To explain Darwin s theories of evolution by natural selection To discuss descent with modification – PowerPoint PPT presentation

Number of Views:465
Avg rating:3.0/5.0
Slides: 21
Provided by: w3wLakel
Category:

less

Transcript and Presenter's Notes

Title: Charles Darwin and Natural Selection


1
Charles Darwin and Natural Selection
  • Objectives
  • To explain Darwins theories of evolution by
    natural selection
  • To discuss descent with modification

2
I. Darwins Ideas Influenced by
  • A. Lamarcks Theory of Evolution
  • B. Voyage on the Beagle (1831-1836)

3
(No Transcript)
4
Lava lizard
Swimming Lizard
5
Land Iguana - Galapagos
Marine Iguana - Galapagos
Green Iguana S. America
6
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
TTTTTTTTTTTTTTTTTTTTTTTTT
7
Influences on Darwin
8
TIME was very important to Darwins theory
  • C. Geologists James Hutton and Charles Lyell
  • 1. Earth is much older than a few thousand
    years
  • 2. Processes shaping Earth have occurred for
    millions of years

9
D. Thomas Malthus, Economist
  • 1. Human population is increasing competition
    for food, water, space
  • 2. War, famine and disease prevents this

10
E. Artificial Selection
  • 1. Breeders select best traits to produce next
    generation

11
II. Darwins Theory of Evolution by Natural
Selection
  • A. Over time, the number of individuals that
    carry advantageous traits will increase in a
    population
  • B. Occurs in 4 steps

12
Darwins Theory of Evolution by Natural Selection
  • 1. Living things overproduce

13
Darwins Theory of Evolution by Natural Selection
  • 2. There is variation among offspring

14
Darwins Theory of Evolution by Natural Selection
  • 3. There is a struggle to survive

15
Darwins Theory of Evolution by Natural Selection
  • 4. Those that survive are most fit

16
C. Natural Selection Survival of the Fittest
  • 1. Fitness ability to survive and reproduce
  • 2. Fitness is the result of adaptations
    inherited characteristics that increase an
    organisms chance of survival

17
Adaptation
18
III. Descent with Modification
  • A. Over time, natural selection produces
    organisms with different structures
  • B. Todays species look different from their
    ancestors
  • C. Each species descended with changes over time

19
1965
1975
FORD MUSTANG
2005
1985
1995
20
Descent with Modification
  • D. Implies that all living things are related to
    one another
  • E. COMMON ANCESTOR
Write a Comment
User Comments (0)
About PowerShow.com