Lecture 2 Flashcards
evolution
change in living things by descent with modification, change in form and behaviour or organisms between generations
Biological change
developmental change within the life of an organism like againg, not technically evolution
ecosystem composition change
made up of a number of species, there are different species in the same habitat than what were there 10 years ago, still not evolution
True definition of evolution
a change between generations within a population of species
Evolutionary modification
takes place in a series of populations that are descended from one another
Properties of Evolutionary Modification
-Not predictable
-depend on the environment and genetic variants
-tree-like patterns
-variety created by splitting of lineages since the common ancestor
Adaptations
Properties of living things that enable them to survive and reproduce in nature
4 main stages of historic rise of evolution
- evolution and non-evolutionary ideas before Darwin
- Darwins theory (1859)
- The eclipse of darwin (1880-1920)
- The modern synthesis (1920s-1950s)
Evolutionary and non-evolutionary ideas before Darwin
A century before Darwin, naturalist and philosophers were interested that one species might change into another but they didn’t really have any theories as to why or how
Lamarck
Transformism, species persisted indefinitely, changing from one form to another no branching no extinction
Darwinian evolution
tree-like lineages split, allowing for the extinction
Cuvier
Proved Lamarck wrong said species went extinct but had separate origins and there was no changes
Charles Darwin
Beagle voyages to the Galapagos Islands each island had its own distinct species of finches
what was the link between species
Darwin looked for a mechanism: natural selection
Natural Selection
forms that are better adapted to survive will leave more offspring and increase the frequency from one generation to the next