Unit 7 Flashcards
Natural selection
Trait that improve survival/reproduction with accumulate in the population
Genetic drift
Chance events changing frequency of traits in a population
Not adaptation to environment or selected
Most often in small populations
Predation selection
Speed, behaviors, comouflauge
Sexual selection
Acting on reproductive success
Fertility, attractriveness to mate
Physiological selection
Actng on body functions
Disease resistance
Founder effect
Small group splits off and starts a new colony (colonizers)
Bottleneck
A disaster reduces population to small number and then population recovers with limited gene pool
Gene flow
Migration (emigration and immigration)
5 agents of evolutionary change
Mutations - chemical changes to DNA
Gene flow - migration (immigrating and emigration)
Non random mating - sexual selection
Genetic drift - small population, not representable
Selection - natural selection for traits
Hardy Weinberg equilibrium
Null hypothesis
Remove agents of evolutionary change (NONE)
Allopatric
Geographic seperation
“Other country”
Sympatric
Still alive in same area
“Same country”
