Natural Selection Flashcards
What is evolution defined as?
a process in which something passes by degrees to a different stage
What are the core principles of evolution?
populations of living things change with time
life is linked through a common ancestor
environment influences this change
What is natural selection
an evolutionary process in which individuals with survival-promoting traits reproduce at higher rated
In natural selection what traits become more common in the population?
favorable traits
what are the conditions for natural selection?
Variation
heritability
favorability
time
what is variation
there must be variation in the population
what is favorability
there must be an advantage to the trait
what is heritability
the trait must be heritable
how does dime effect natural selection
favorable traits will accumulate over time
What are types of natural selection?
Directional
stabilizing
disruptive or diversifying
What is directional natural selection
favoring one extreme phenotypew
what is stabilizing natural selection
when one non-extreme phenotype is favored
what is disruptive or diversifying natural selection
when two extreme phenotypes are favored
What is positive frequency-dependent selection
common phenotypes have a fitness advantage
what is negative frequency-dependent selection?
common phenotypes are selected against
