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Geraud Chapter 6

TermDefinition
species group of organisms that share similar characteristics and can reproduce among themselves
evolution change in inherited characteristics over time
natural selection a process by which organisms with traits best suited to their environment are more likely to survive and reproduce
variation inherited trait that makes an individual different from other members of the same species
adaptation any variation that makes an organism better suited to its environment
gradualism model describing evolution as a slow process by which one species changes into a new species through a series of mutations
punctuated equilibrium model describing the rapid evolution that occurs when mutation of a few genes results in a species suddenly changing into a new species
camouflage adaptation in which coloring of organism blends into its environment
survival of the fittest organisms with the best traits survive and reproduce
Lamark's theory of evolution traits acquired during a parent's lifetime are passed on to offspring
Darwin's theory of evolution mutations occur with offspring and if they are advantageous the organism survives and reproduces, over time a new species can evolve
sedimentary rock a type of rock in which fossils are found, forms from mud, sand and silt
radiometric dating calculating the age of a rock layer using radioactive elements
embryology study of embryos and their development
homologous body parts that are similar in structure and origin and can be similar in function
vestigial structures structure that doesn't seem to have a function and may once have functioned in the ancestor
relative dating older rocks lie below younger rocks
fossils remains of an organism, could be bone, footprints, or cast of body
primate group of mammals including humans, monkeys, and apes that share characteristics such as opposable thumbs and flexible shoulders
hominid humanlike primate that appeared about 4 million to 6 million years ago
Homo sapiens early humans that likely evolved from Cro-Magnons
wise human meaning of Homo sapien
DNA deoxyribonucleic acid, molecule that contains instructions for making an organism
opposable thumb thumb can touch fingers on same hand, adaptation for grasping and climbing
"Lucy" name given to female Australopithecus skeleton found in Africa
Cro-Magnon hominid that was very human like, most likely ancestor to Homo sapien
Created by: geraud.aaron