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Evolution and Natural Selection
Evolution and natural selection vocabulary
36
Biology
9th Grade
02/03/2010

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Term
analogous structure
Definition
similar in appearance or function, but derived from different ancestral structures
Term
vestigial structure
Definition
structure that an ancestory used but is no longer functional in a current species
Term
fossil
Definition
any evidence of an organism that lived long ago (remnant, trace, or impression)
Term
extinction
Definition
when all the members of a species die out
Term
extinct
Definition
a species that no longer exists
Term
biochemistry
Definition
comparing DNA, RNA, and amino acid sequences in closely related organisms
Term
embryology
Definition
the study of the early stages of development in an organism, especially the comparison of closely related species.
Term
zygote
Definition
the first diploid cell resulting from the fusion of two gametes
Term
embryo
Definition
an organism in the early stages of development
Term
phylogenetic tree
Definition
A tree-like diagram that depicts relationships between species
Term
speciation
Definition
the creation of new species by splitting a population in two, each with its own adaptations to environmental pressures
Term
evolution
Definition
change of allele frequency in a population over time
Term
fossil record
Definition
the history of life as preserved in fossils
Term
radiometric dating
Definition
a method for dating rocks by measuring radioactive decay
Term
radioactive decay
Definition
the alteration of atoms as sub-atomic particles are released slowly over time
Term
genetic variation
Definition
differences in inherited traits among members of a population
Term
natural selection
Definition
theory of how evolution occurs, organisms with advantageous genetic traits survive and reproduce more than less fit individuals
Term
adaptation
Definition
a genetic trait the confers fitness to an organism in its environment
Term
over-production
Definition
when organisms produce more offspring than the environment can support
Term
competition
Definition
when two organisms of the same or different species want the same resources (food, territory, shelter, mates, etc.)
Term
selection
Definition
when organisms with more advantageous traits survive and reproduce while others do not
Term
offspring
Definition
products of reproduction, i.e. children
Term
generation
Definition
all organisms of a species born within a period of time
Term
Jean Baptiste Lamarck
Definition
French naturalist who proposed that evolution resulted from the inheritance of acquired characteristics
Term
Inherited characteristics
Definition
characteristics passed down from parent to offspring in genes
Term
Acquired characteristics
Definition
characteristics an organism obtains throughout its own lifetime
Term
Darwin, Charles
Definition
Revolutionary scientist who proposed evolution by natural selection in his book "On the Origin of Species" published in 1859
Term
Galapagos Islands
Definition
An archipelago off the coast of Ecuador where Charles Darwin made many observations
Term
environmental pressure
Definition
a condition or event that can hurt a population of organisms
Term
gene pool
Definition
the collection of all the alleles available in a population
Term
morphology
Definition
the form and structure of an organism
Term
Gould, Stephen Jay
Definition
Evolutionary biologist who proposed punctuated equilibrium in 1972
Term
punctuated equilibrium
Definition
Theory that species spend long periods of time without evolving between spurts of quick change
Term
relative dating
Definition
estimating the age of a rock by comparing with the age of nearby rocks
Term
absolute dating
Definition
determining the exact age of a rock by means of radioactive dating
Term
homologous structure
Definition
derived from the same ancestral structure
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