12.4.3 Evolution 2
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Transcript of 12.4.3 Evolution 2
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State Standard Review12.4.3
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• ___________ is a change in a species over a long period of time.
EVOLUTION
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• Evidence for evolution:• FOSSIL RECORD• HOMOLOGOUS STRUCTURES
• SIMILAR EMBRYOS• SAME DNA/PROTEINS
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• If the bone structure in an animal becomes more advanced throughout the years it supports evolution because of the gradual change taking place.
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• ___________________________-• similar structures which indicate common ancestry
HOMOLOGOUS STRUCTURES
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• Vertebrates are believed to have had common ancestry because there are marked similarities between the embryos of each class.
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• The same blood protein in a group of species provides evidence that the species descended from a common ancestor.
Universal genetic code: SAME nitrogen bases code for SAME codons code for SAME amino acids code for SAME proteins
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• Is the only evidence for evolution in the fossil record?
•NO
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• An ___________ is a trait that helps an organism survive and reproduce.
ADAPTATION
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• ____________________ is the change in a population in which organisms with favorable variations live, reproduce, and pass on their favorable traits.
Heavy duty beak Small beak
NATURAL SELECTION
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• In evolution, BOTH environmental factors AND heredity play a role.
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• Factors which bring about changes in species over time:• Temperature• Space• Competition
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• Large populations aided by many mutations will provide the greatest potential for evolutionary change
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• In _________________________ it was thought that living things could arise from nonliving things.
SPONTANEOUS GENERATION
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• Scientists think that the first cells resembled
_______________________PROKARYOTIC BACTERIA
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• Miller & Urey modeled atmospheric & temperature conditions on early earth to produce organic compounds.
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• Plants and animals w/ similar adaptations evolve in similar environments.
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• Organisms suited well to their environment reproduce more successfully than those less suited to the same environment.
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•Charles Darwin was the author of The Origin of Species.
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The Origin of Species
• Darwin’s Journey on the H.M.S. Beagle• Explosed him to a variety of different
ecosystems• His observations of these different
ecosystems and the organisms that made up those systems led him to the conclusions found in this book.