theories of evolution

Lamarck principles

use and disuse, inheritance of acquired characteristics

use and disuse

structures an individual used became larger and stronger, not used became weaker and smaller

inheritance of acquired characteristics

individuals could acquire traits during their lifetimes as a result of experience or behavior, then could pass on those traits to offspring

Lamarcks contributions

- all species evolve over time
- a species evolves in response to its environment and becomes better adapted to that environment
- changes are passed on from generation to generation

Darwin's 2 ideas

species come from earlier life forms and adapt to their environment over generations

artificial selection

the selective breeding of organisms by humans for specific characteristics

VISTA

Variation, Inheritance, Selection, Time, Adaptation

variation and inheritance

Any difference between individuals of the same species. ex tall parents have tall children

selection

organisms better suited for their environment will survive and reproduce

time and adaptation

advantageous traits help some individuals survive and reproduce overtime. results in better adapted population

natural selection

natural selection explains how the environment acts to favour reproductive success of individuals with certain traits

Curvier's Theory of Catastrophism

global catastrophes caused widespread extinction of species

Lylle's theory of uniformitarianism

1) earth has been changed by the same processes in the past that are occuring in the present \n 2) geological change is slow and gradual rather than fast and catastrophic \n 3) natural laws that influence these changes are constant and eternal, and they operated in the past with the same intensity as they do today