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The Theory of Evolution: Variation and Adaptation

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Within a species, an amazing amount of variation exists. Species: interbreeding populations of ... Is the Quagga extinct? It has been bred back. Adaptation ... – PowerPoint PPT presentation

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Title: The Theory of Evolution: Variation and Adaptation


1
The Theory of Evolution Variation and Adaptation
  • Chapter 10.1

2
2 Minute Quick write
  • What is the purpose of life, from a biological
    point of view?
  • Bonus Name this sculpture..
  • Who sculpted it?
  • Have you seen it?

3
Within a species, an amazing amount of variation
exists
  • Species interbreeding populations of organisms
    that can produce healthy offspring.
  • Variation the differences between individual
    members of a population.

4
Variation within a species
  • Some variations you can see size, color, shape
    of teeth, etc.
  • Some variations can not be seen, they are
    biochemical blood type or hormone level.

5
Variation within a species
  • Some variations you can see size, color, shape
    of teeth, etc.
  • Some variations can not be seen, they are
    biochemical blood type or hormone level.

6
Variation within a species
  • Many variations are genetic, and can be
    inherited.
  • They result from mutation and recombination.

7
Variation from Mutation
  • Most mutations are neutral or harmful
  • Some are beneficial in certain instances
  • Gray fox in snow
  • Light skin in colder climate.

8
Variation from recombination.
  • Most variation comes from recombination of
    existing alleles.
  • During sexual reproduction, alleles recombine 3
    ways
  • Independent assortment of chromosomes.
  • Crossing over during meiosis
  • Random fertilization.

Is the Quagga extinct? It has been bred back.
9
Adaptation
  • Adaptation an inherited trait that increases a
    populations chance of survival and reproduction
    in a particular environment.

The anteaters snout is an example of adaptation.
10
Nichea habitat and the role a population plays
in that habitat.
  • Includes where organisms live, what and how they
    eat, how they raise offspring, who their
    predators are.
  • Conditions such as space, light, moisture and
    temperature are included.
  • When two populations try to occupy the same
    niche, fierce competition arises.
  • What are they competing for ?

11
10.1 Biodiversity
  • Biodiversity The variety and abundance of
    species that make up a biological community.
  • Is biodiversity good?
  • Change creates advantages for some species and
    disadvantages for others.

12
10.1 Biodiversity
  • Biodiversity Earth is home to 15 million
    species.
  • 99 percent of all types of organisms that ever
    lived are now extinct.
  • Change creates advantages for some species and
    disadvantages for others.

13
10.1 Biodiversity
  • Earths history can be studied using fossils, the
    preserved remains or imprints of ancient
    organisms.
  • Scientists who study fossils are paleontologists
  • Fossils are found in sedimentary rock

14
How are fossils formed?
15
10.1 Biodiversity
  • Paleontologists dont have a complete record of
    the history of life.
  • Soft bodied animals dont make good fossils.
  • Fossils are vulnerable to erosion and weathering.
  • They are hard to find.
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