evidence of evolution
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Evidence of Evolution. Fossils Provide Evidence. Animal fossils show a pattern of development from early ancestors to their modern descendants. There are gaps in the fossil record. Fossils are rare. - PowerPoint PPT PresentationTRANSCRIPT
Evidence of Evolution
Fossils Provide
EvidenceAnimal fossils show a
pattern of development from early ancestors to
their modern descendants.
There are gaps in the fossil record.
Fossils are rare
http://www.google.com/imgres?imgurl=http://www.wallsofthewild.com/pterodactyl.jpg&imgrefurl=http://www.wallsofthewild.com/pter.htm&usg=__9caIuOdNvnUNeTtJd_BwijJIK5M=&h=479&w=800&sz=100&hl=en&start=0&zoom=1&tbnid=vSsuBQ-o-EFlxM:&tbnh=131&tbnw=219&ei=-6ahTYjRF6iU0QGo5JSEBQ&prev=/images%3Fq
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FOSSIL:The preserved or
mineralized remains (bone, petrified tree,
tooth, or shell) or imprint of an organism
that lived long ago.
http://www.maropeng.co.za/images/uploads/fossil_lg.jpg
Three Major Points
• Earth is about 4.5 billion years old
• Organisms have inhabited the earth for most of its history
• All organisms living today evolved from earlier, simpler life-forms.
Crinoid fossil
Found in an 800 MILLION year old rock
from Indianahttp://
www.youtube.com/watch?
v=cZcomBnNKXg
Paleontologist
Scientist who studies fossils.
http://blogs.answersingenesis.org/museum/pictures/Dino-dig-8-30-06-0151.jpg
Paleontology
• Paleontologists can determine how old fossils are.
• They use radiometric dating to determine the half life.
• http://www.furryelephant.com/content/radioactivity/half-life-simulation/
Evolution of Whales
http://biologos.org/uploads/static-content/Figure_1.png
Biological Molecules Provide Evidence
Proteins
Amino acids are the building blocks of proteins
Amino acid + amino acid + amino acid = PROTEIN
The more amino acids two species have in common, the more closely related they are.
Hemoglobin Comparisons with humans
SpeciesAmino Acid differences
Gorilla 1
Rhesus monkey 8
Mouse 27
Chicken 45
Frog 67
Lamprey 125
Biological Molecules Provide Evidence
Nucleic Acids
Scientists can determine the number of nucleotide differences among organisms to see how closely
related they are.
They make DNA comparisons.
Anatomy & Development Suggest
Common AncestryVestigial Structures
Homologous Structures
Development of Embryos
Vestigial structures:
Structures that are present in an organism but are
reduced in size and are no longer useful.
Examples: Wings of flightless birds, fingernails
on manatee fins, and goosebumps (not a
structure but a reaction).
Homologous structures
Structures that similar in form but different in
function.
Examples: Forelimbs of vertebrates
Development of Embryos
Guess the Embryo
http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html