Evolution , Biodiversity And Population Ecology Flashcards
Biodiveristty
Variety of org in a given area encompassing
Species
Gene
Pop and habitats
Species
Tupe of org whose member share certain characteristics
Evolution
A genetic shift in the composition of traits acroos the generations
—— is the foundation if modern biology
Evolution theory
When is a hypothesis incorporated into a theoru
A hypothesis thats passes tests of repeatability, reproducibility,
Theory
Well tested, widely accepted, repeatedly validated exolanation of a cause and effect relationship
Natural selection
Process in which the adaptive traits passed down more frequently then the maladaptive traits
Adaptiv etrais
Help in survival
Maladaptive
Reducess success
—- engine of biolpgical evolution
Natural selction
Mutations
Accidental mistekes during dna replication gives rise to variability on which natural selction occurs
Process of evolution
Lots of offspring
Geneteic variablity due to mutations or heridatary
Natural selection acts on these
Increased competition - Species eith better adaptive traits, survive better and reproduce more
Species with less adaptive traits die out and dont reproduce as much - t
The next generation has more of adaptive traits
A shift in genetic composition can be seen in the population (with adaptive traits)
Later these reproduce more and the better adaptive traits dominate
3 types of natural selection
Directional
Stabalizing
Disruptive
Direction
When natural selction DRIVES a trait in one dorection
Stabalizing
When n.s FAVORs intermediate traits and preserves status quo
