Evolution Review Mrs. Swanson

most organisms are average for a triat, with few having extreme phenotypes

the geologic processes that shape earth are uniform throughout time

the movement of alleles from one population to another (immigration or emigration)

natural disasters occur often in Earth's history

a type of natural selection that favors a phenotype at one extreme

The Hardy-Weinberg Principle states that a population is not evolving if...

females are choosy about finding a male mate (OPPOSITE sex)

evolution towards similar characteristics in unrelated species

when a small # of individuals colonize a new area

a reproductive isolating mechanim that prevents hybrid offspring from developing or breeding

individuals with beneficial traits produce more offspring than others in a population

2 or more species evolve in response to a relationship with one another

certain traits increase an organism's chance of finding a mate

an observable change in allelic frequencies over time

closely related species evolve in different directions

structures which are similar in function, but not similar in their origin

Structures which have no current function

changes occur slowly over long periods of time

a type of natural selection that favors a phenotype in the middle, or the "average" phenotype

a pattern in speciation when new species arise suddenly; followed by period of little change

The main principles of Darwin's theory of natural selection include....

type of natural selection that favors both extreme phenotypes, but selects against the average

differences in a physical trait amongst organisms of the same species

when a population size is greatly reduced, limiting genetic variation

Which of the following is NOT a prezygotic isolating mechanism?

believed acquired characteristics could cause change in a population over time

changes in allelic frequency due to chance events, such as overhunting, natural disaster

structures which are similar in structure, but have different functions

developed the first system of classification

the process by which humans have changed species through selective breeding

pattern in speciation where one species diversifies into many new species

Which of the following is NOT a postzygotic isolating mechanism?

competition between members of the SAME sex (i.e. male vs. male)

a reproductive isolating mechanim that prevents reproduction before a zygote is formed

a inherited trait that allows an organism to better survive in their environment