quiz 2 unit b Flashcards
evolution history
- natural selection explains how populations change over time
- NOT INDIVIDUALS *
jean baptiste lamarck
inheritance of acquired characteristics
- was refuted
alfred wallace and charles darwin
- theory of natural selection
5 principles of evolution by natural selection
- mutations occur in DNA
- mutations can give an individual selective advantage
- natural selection can cause a change in population
- individuals who survive leave more offspring in the population
- time: happens over many generations
divergent evolution
- common species gives rise to new species
- could potentially lead to a new species
seperate species
cannot interbreed
rate of change hypotheses
- punctual equilibrium
- gradualism
punctual equilibrium
variation occurs in bursts of species but many gaps gust in the fossil record
gradualism
slow changes are seen throughout the fossil record
artificial selection
males and females are chosen to breed based on a characteristic we want
genetically modified organisms (GMO)
changing the DNA
fossils
rocks are formed when organic structures have been replaced by minerals
homologous structures
have a common ancestor but have changed slightly to perform better in their niche
analogous structures
dont have a common ancestor but look/act similarly
vestigial structures
common to an ancestor but which is no longer used i the current version of a species
ex. tailbone, wisdom teeth