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Transcript of mscheierclass.files.wordpress.com · Web viewprovide _____ for evolution because they suggest...
Name________________________________________________
Evolution Lecture Notes part IIEvidence for Evolution
Fossils:
Fossils are _____________________________________, plants, and other organisms from the distant past
They show ________________________________________.
Radioactive Decay and the age of fossils:
Wikipedia Explains….
Most chemical elements are ____________. If they are not part of a chemical reaction, they do not change.
Chemical elements are made of _______ _ . In stable elements, the atom stays the same.
In the 19th century, Henri Becquerel discovered that some chemical elements have atoms that change: During their change they send out a __________________________________.
In 1898, Marie and Pierre Curie called this phenomenon ________________________________.
Half Life:
The half-life of a substance is the time it takes for half of the substance to decay.
1. What is the half life of Potassium 40?____________2. After 2.5 billion years what percent of the original
potassium-40 would be left? ________3. After 5 billion years what happened to the potassium-40?
______________________________________________
Vestigial Structures:
Structures that have _____________________________ through evolution
provide ______________ for evolution because they suggest that an organism changed from using the structure to not using the structure, or using it for a different purpose
____________________________!
Ex: Penguins using wings to swim, not fly.
Ex: Appendix, wisdom teeth, ____________
Homologous Structures:
structures that occur in different species that originated by _____________________ from a __________________________.
Evidence from Embryos:
Embryology: _____________________________________________________________________________________
DNA Similarities:
___________________________ are used to determine how closely two species are related by calculating the
number of differences between the species' DNA sequences or _____________________ sequences.
The fewer the differences, the __________________________________________________ from each other and began to evolve into different species
Ex: All organisms that use oxygen have the enzyme cytochrome c.
Types of Evolution:
Convergent:
NOT from _______________ common ancestor
Look similar because evolved to live in the ___________________________
Divergent:
Came from _______________________________.