Post on 29-Dec-2015
transcript
EVOLUTION, DARWINNatural Selection
S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today survive and adapt to their
surroundings.
What Did Darwin’s Travels Reveal
• The diversity of living species was far greater than anyone had previously known
• These observations led him to develop the Theory of Evolution
How did tortoises and birds differ among the islands of the
Galapagos?
• Each island
had its own type
of tortoises
and birds that
were clearly
different from
other islands
Natural Selection
• The traits that help an organism survive in a particular environment are “selected” in natural selection
Evolution is when organisms change over time
So, modern organisms descended from ancient ones
Evidence of EvolutionReview
• Fossil Record provides evidence that living things have evolved
• Fossils show the history of life on earth and how different groups of organisms have changed over time
Primate Fossils
Primate Bone Structure
Primate Brain Capacity
Vestigial OrgansEvidence of Evolution
• Organ that serves no useful function
• Present day organisms evolved from ancestors in which these organs were useful
Biochemical Evidence• All living organisms are made of the same
20 common amino acids
• All living organisms have DNA as the code of life with the same 4 bases: adenine, thymine, cytosine, guanine
Homologous StructureEvidence of Evolution
• Body parts that are similar in structure in different organisms and seem to have developed from the zygote the same way
• Homologs may have different uses in different species
Similar EmbryosEvidence of Evolution
• In their early stages of development, chickens, turtles and rats look similar, providing evidence that they shared a common ancestry.
Natural Selection Videohttp://science.discovery.com/videos/100-greatest-discoveries-shorts-natural-selection.html
http://www.youtube.com/watch?v=vfmOaAz371M&NR=1&feature=endscreen
Origin of Species Video