Intro to evolution Flashcards
Evolution
The process by which modern organisms have descended from ancient organisms
Species Vary Globally
ecological similar animal species inhabited are separated,but similar around the globe
- different areas but same temp
Species Vary Locally
Within a local area
Darwin noticed that different yet related animal species occupied different habitats within a local area
Species Vary Overtime
Gain or lose traits based on environments
Jean Lamarck
-First theorist but very wrong
-Had the idea that species can pass on traits that they gain
-Use and disuse - individuals lose characteristics they do not require (or use) and develop characteristics that are useful
Thomas Malthus
English economist That noticed that people being born faster than the rate that they were dying
Natural selection
the process where organisms with variations are suited to their environment survived leave more offspring
Fitness
describes how well an organism can survive /reproduce in it’s environment
Darwin
Sailed on the HMS beagle”s five year voyage
-characteristics in population must be inherited
-more offspring are produced than surviving
-fittest offspring must be most likely to survive than reproduce
Alfred Wallace
Believed natural selection depends on the ability of organisms to reproduce and leave descendants.
Big 3
- more individuals are born that can survive (struggle for existence)
-There is natural heritable variation (variation and adaption) - There is variable fitness among individuals(survival of the fittest)