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Species
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Genetic Variation
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Adaptation 7th Grade

TermDefinition
Species A group of organisms that possess similar genes and traits which no other group possesses.
Genetic Variation Slight differences in an organism's traits that are considered normal.
Phenotype The physical appearance, behavior or trait of an organism.
Trait One form of a visible characteristic or behavior determined by a particular allele.
Allele Different forms of the same gene that contain slightly different genetic information for slightly different traits.
Dominant An allele that will produce a trait that masks another (recessive) trait for the same characteristic.
Recessive An allele that produces a trait that is masked by a dominant trait.
Genotype The genes that determine an organism's phenotype.
Environment An organism's physical surroundings, such as food supply, soil, weather, water, trees, and mountains.
Adaptation An increase in the proportion of the individuals of a species that possess a necessary trait, allowing the species to survive a change in an environmental factor.
Extinct When all individual organisms of a species have died.
Environmental Pressure A change in an organism's environment that selects for organisms with slight differences in a trait that give that organism a survival or reproductive advantage.
Natural Selection Sometimes called "Survival of the Fittest."
Fossil The remains of an organism, often its bones that are left after it has died.
Paleontologist A scientist who uses fossils to study organisms that once existed but are now extinct.
Created by: ireneott
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