Theories of Evolution. Darwin vs. Lamarck. Jean-Baptiste LaMarck. French, Early 1800’s Theory of Inheritance of Acquired Characteristics Two main points…. 1. Principle of Use & Disuse: Most used body structures develop, unused structures waste away.
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Theories of Evolution
Darwin vs. Lamarck
1. Principle of Use & Disuse:
2. Inheritance of Acquired Characteristics:
“Survival of the Fittest”
All of the changes that have occurred in living things since the beginning of life on Earth
links reptiles and birds
structures that are similar because they were inherited from a COMMON ANCESTOR
similar in function, but NOT inherited from a common ancestor
NOTE: similar structure, but NOT always function!
NOTE: similar FUNCTION, but not STRUCTURE
Vestigial Structures are undeveloped structures that were functional in some ancestor, but are no longer needed in that organism.