Natural Selection
To survive and reproduce.
What is fittness?
Organisms that can interbred to produce fertile offspring.
What is a species?
A cladogram shows...
What is evolutionary relationships?
The fossils found deeper down rock layers come from ___________ species.
What is older?
A type of natural selection that shifts a population's characteristics in one direction.
What is directional selection?
Differences that exist within a population because of mutation or sexual reproduction.
What is variation?
When a population is separated by a geographic barrier and cannot mate, which can lead to speciation.
What is reproductive isolation?
The place where two branches between organisms meet, represents this.
What is common ancestor?
Similar bones found in different species because of a common ancestor.
What is homologous structure?
When the middle characteristic in a population is most fit.
What is stabilizing selection?
Species within a population fight for limited resources.
What is competition?
Another word for speciation, which refers to the fact that a population was once one species and evolved to form two.
What is divergent evolution?
The most accurate cladograms are created with.
What is molecular (DNA/protein) evidence?
structures with similar functions but different origins, such as wings in bats and insects.
What is analogous structure?
If the extreme phenotypes are selected.
What is disruptive selection?
The theory that individuals can change their own traits and pass them down to offspring.
What is theory of acquired characteristics or Lamarck's theory?
Darwin's finch's experience speciation for this reason.
What is different environments on each island.
Some organisms that have common characteristics are not always closely related, genetically because of this type of evolution.
What is convergent evolution, analogous structures?
Fossils that show intermediates states between ancient and modern species.
What is transitional fossil?
A type of selection that is controlled by human beings (as in dogs or horses).
What is artificial selection?
Natural selection is a type of this type of evolution because it shows how specific populations change over several generations (short period of time).
What is microevolution?
What type of organism might experience speciation the most quickly?
What is bacteria because each generation is very short?
The branching of cladograms represents a zoomed out view of how species evolve over a long period of time.
What is macroevolution?
Many different species have look very similar at the beginning of their fetal development.
What is embryology evidence?
A random event that leads to a change in DNA/characteristics.
What is mutation?