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Chapter 19 Vocab
vocab for quiz
16
Biology
9th Grade
03/09/2011

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Term
paleontology
Definition
The study of ancient relics
Term
pseudogenes
Definition
Duplication of a gene produces gene families—multiple
copies of nearly identical DNA sequences. These are the genes that no longer function.
Term
speciation
Definition
the appearance of a new
species
Term
polyploidy
Definition
duplication of
chromosomes
Term
adaptive radiation
Definition
rapid increase in
speciation
Term
stasis
Definition
A condition in which the rate of large-scale change remains very slow for a long period.
Term
gradualism
Definition
A pattern of evolution in which new
species split off from ancestral species, and both continue to change at
similar rates
Term
punctuated equilibrium
Definition
A pattern of evolution that involves a short period of rapid change just after a population becomes isolated and forms a new species, after which the process slows down and approaches stasis
Term
Evolution
Definition
the change of organisms over time
Term
natural selection
Definition
a mechanism by which evolution works
Term
fossils
Definition
formed from bones, impression left by organism, may be preserved
Term
Coevolution
Definition
the evolution of two species interacting with each other and reciprocally influencing each other's adaptations
Term
alkaloids
Definition
chemical compounds that can make a plant taste bad or be poisonous
Term
silica
Definition
makes plants hard to chew
Term
artificial selection
Definition
used by humans- same as natural selection but artificial
Term
homologies
Definition
structures that show common ancestry because of a similar structure, but may have different functions, or may be adapted to different functions
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