Evolution
how does DNA prove evolution
DNA shapes how an organism grows up and the physiology of its blood, bone, and brains
adaptation
a heritable change in phenotype increases an animals change of successful reproduction in a specified environment
population bottleneck occurs when
a population is drastically reduced in number
define fitness
if you can survive long enough and gather enough resources to have an offspring
no offspring = failure
the sum of all the genetic information of all the members of the population
define evolution
the change in the inherited traits of a population of organisms through successive generations.
explain how the biological species concept is used to determine if 2 animals are different species
the change in inherited traits over successive generations in populations of organisms.
population has a high or low genetic diversity
low
directional selection
individuals at one extreme of a range of phenotypes have an advantage
mutation
a change in the sequence of an organism's DNA.
define biological evolution
the change in inherited traits over successive generations in populations of organisms.
persistence and resilience
how long a variable lasts before it is changed to a new value
a population is growing or shrinking based on the number of births, deaths, immigrants and emigrants
Populations gain individuals through births and immigration. They lose individuals through deaths and emigration.
stabilizing selection
individuals with immediate phenotypes within the range have an advantage
gene flow = ?
gene flow= mechanism for evolution
how do fossils prove evolution
they show that life on earth was once different from life found on earth today.
how does moderate disturbance promotes biodiversity
disturbances lead to species movement into the newly cleared area
how does population grow under ideal circumstances and under natural circumstances
Under ideal conditions, populations can grow exponentially.
artificial selection
human choose which traits will increase an individuals chance for reproducing
how does natural selection cause population to evolve
survival of the fittest
how do embryos prove evolution
Embryos of different species can have similarities that are not visible when the organisms are fully formed.
coevolution
how mimicry can be used to deter predators
they trick predators into going for their tails rather their heads and avoid fatal attacks.
how old is the earth
4.5 billion years old
speciation
formation of new species occurring when 2 populations or subpopulation become different mating between population no longer occurs