Natural Selection Lab Archaeopteryx fossil Passenger pigeon, which became extinct in the early 1900s...
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Transcript of Natural Selection Lab Archaeopteryx fossil Passenger pigeon, which became extinct in the early 1900s...
Natural Selection Lab
Archaeopteryx fossil Passenger pigeon, which became extinct in
the early 1900s due to human hunting
I’iwi, Hawaiian honeycreeper
By Jane Horlings
History
• Ideas about evolution originated before Darwin
• Aristotle
• Fossils
• Jean Baptiste de Lamarck– Inheritance of acquired
characteristics
Aristotle (UL), Ammonite fossil (UR), Lamarck (L)
History
• Lamarck – Characteristics which an organism
developed during its lifetime were inherited
– Now known to be invalid
History
• Charles Darwin
• H.M.S. Beagle
• South America & the Galapagos
Islands
H.M.S. Beagle (U), Galapagos turtle (LL), Darwin at early age (LR)
History
• Other scientists and research influenced Darwin’s theory
• Charles Lyell: Principles of Geology
Lyell
History
• Darwin proposed that evolution occurs by natural selection
• On the Origin of Species by Means of Natural Selection published in 1859
• Darwin's theory had four parts:
1. Organisms produce more offspring than can survive to reproductive age
2. Members of a population vary and some of these variations are heritable
3. Resources available to a population are limited
4. Organisms with the most favorable traits have differential reproductive success, and those traits are passed to the next generation
History
• Selection = when some individuals leave behind more offspring than others, and the rate at which they do so is affected by their inherited characteristics
• Selection can be artificial or natural
Selection
Peppered moth
• Natural selection
• Natural selection is the result of differential reproduction by members of a population
• “Reproduction of the fittest!”
Selection
See? The offspring in the last
generation now all have the gene
allowing them to be resistant to the
pesticide! This is a great example of
selection!
Selection