2.6 Adaptions

Fitness and Adaptions

all populations have some genetic diversity or variablility in genomes of individuals

Genetic diversity exist because…

• random mutations while DNA is being copied create new traits

• Crossing over in parent chomosomes created new combination genes (therefore traits)

Adaption

a new trait that increase an org. fitness or ability to survive and reproduce

Natural Selection

org. better adapted to their environment are gonna survive and reproduce more offspring

• individual w/ adaptions pass on and org. w/o die off (evolution)

selected pressure

environmental condition that kills individual w/o adaptation

Environmental Change and Evolution

the environment an org. lives in determines which traits are adaptations

• as environment change, different traits may become adaptations and old traits may become disadvantages

Ex. drought kill off finches w/ harder beaks, making larger beaks for cracking harder seed an adaptation

Pace of Evolution

the more rapidly an environment change the less likely a species in the envi. will be able to adapt to those changes

• if too rapid species may migrate out or die off completely

Good mutations = higher chance

the more genetic diversity in an population the better they’re able to adapt to that environmental change

Life Span

longer life span of an organism the slower the rate of evolution

Ex. bacteria can adapt and evolve in a day