17 terms

Evolution

Use to study for the Evolution Test.
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Fossils
The remains or evidence of living things.
Radioactive Dating
A method used to measure the age of a fossils or the rock that the fossil is found in.
Law of Superposition
States that in a series of sedimentary rock layers, the younger rocks normally lie on top of older rocks.
Fossil Record
The most complete biological record of life on Earth. That shows how complex organisms evolved from more simple organisms
Mutations
A change in a gene that may produce a change (or new trait) in the offspring of an organism.
Anatomical Evidence
To compare the anatomy of organisms to see how closely related they are to each other.
Homologous Structures
When ancestral body parts that are similar in structures evolve. (Bats wing, human arm, dogs leg)
Embryological Evidence
To compare the embryos (early stages of development) of different species to see how closely related they are.
Chemical Evidence
The study of the chemical similarities in DNA molecules.
Molecular Evidence
The more similar the structure of protein molecules of different organisms, the more closely related they are.
Common Ancestor
An ancient organism that is related to a modern organism. They share common traits.
Adaptation
A change in an organism that increases an organism's chance of survival. These changes occur due to mutations in the genes.
Natural Selection
The survival and reproduction of those organisms best adapted to their surroundings.
Bacteria
First living organism on Earth.
Charles Darwin
Developed the Theory of Evolution by Natural Selection
Transitional Form
Any fossilized remains of a life form that exhibits traits common to both a Common Ancestor and its descendant.
Genetic Variations
A variety of genes in a gene pool. No two individules are exactly alike. This allows the species to survive changes in the environment. Sexual reproduction increases Genetic Variation.