debrief of evidence for evolution take notes in your packet
TRANSCRIPT
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Debrief of Evidence for Evolution
Take notes in your packet
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Station 1: Comparative Embryology
• Comparative embryology = the science dealing with the comparison of different organisms’ pre-birth (or pre-hatching) development.
VS.
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Station 1: Comparative Embryology
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Station 1: Comparative Embryology
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Station 1: Comparative Embryology
How does this serve as evidence that supports the Theory of Evolution?
• Argument: the early development of these species is similar because they each evolved from a common ancestor.
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Station 2A: Homologous structures
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Station 2A: Homologous structures
• Homologous structures: structures that are similar across different species due to common ancestry.
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Station 2A: Homologous structures
How does this serve as evidence that supports the Theory of Evolution?
• Argument: even though the forelimbs have very different functions, their similar bone structure suggests that they evolved from a common ancestor.
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Station 2A: Homologous structures
• More examples:
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Station 2B: Vestigial structures
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Station 2B: Vestigial structures
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Station 2B: Vestigial structures
• Vestigial structures: homologous structures that have lost most or all of their function (vestige = “a remnant of”)
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Station 2B: Vestigial structures
How does this serve as evidence that supports the Theory of Evolution?
• Argument: these “useless” structures are remnants of structures that were once useful in an evolutionary ancestor (i.e. tailbone actually supported a tail our evolutionary ancestor)
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Station 2B: Vestigial structures
Other examples:
- Goose bumps
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Station 3: Fossils
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Stratigraphy – relative ages of rocks and fossils
1. Which fossils were alive at the same time? Why?
2. Which fossil(s) are the oldest? How can you tell?
Fossil: AFossil: B
Fossil: C
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But how do we know exactly how old fossils and rocks are?
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Scientists can date both rocks and dead organisms• Radioisotopes – elements that undergo decay at a consistent rate
• Carbon-14 is a radioisotope found in living things.– Scientists can measure the amount of Carbon-14 and it’s decay product
Carbon-12 in order to establish the age of a fossil– It takes 5730 years for ½ of a sample of Carbon-14 to decay into Carbon-12
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How does the fossil record support the Theory of Evolution?
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How does the fossil record support the Theory of Evolution?
There are many fossils discovered that display organisms that do not exist today!
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Imagine digging and coming across this!
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Or this!
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Inference:
• There are many organisms who once roamed the Earth that are now extinct.
• But how do we know that they all didn’t live at the same time
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Connection to evolution:
• Some of these fossils resemble organisms currently living on Earth.
• Different layers of the earth show a progression of evolution
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Let’s look back at our cross-section of the earth
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In review: The fossil record supports the Theory of Evolution
because:
• Fossils show the diversity of life on earth’s timescale.
• We can see a progressive change in species over time.
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Station 4: DNA!
• How many of the same genes do you think humans share with these species:
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DNA evidence
• Which organism is most closely related to a human?
• Which is least closely related?
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Station #4: DNA
How does this serve as evidence that supports the Theory of Evolution?
• Argument: Those with more closely related DNA probably evolved from a common ancestor
• Argument: the structure of genetic code is the same for every organism on Earth! All organisms pass on their traits in the same way.
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Exit ticket
On the back of your paper, write down:
1. The two pieces of evidence for evolution that you find most interesting and…
2. How these two pieces of evidence support the Theory of Evolution