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BIO211- 22
Chapter 22- Descent with Modification: A Darwinian View of Life
13
Biology
Undergraduate 1
01/14/2011

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Term
Strata
Definition
the superimposed layer rock that was covered and compressed by new layers of sediment
Term
Paleontology
Definition
study of fossils
Term
catastrophism
Definition
the principle that events in the past occurred suddenly and were caused by mechanisms different from those operating in the present
Term
uniformitarianism
Definition
mechanisms of change are constant over time
Term
adaptations
Definition
characteristics of organisms that enhance their survival and reproduction in specific environments
Term
artificial selection
Definition
humans have modified other species over many generations by selecting and breeding individuals that possess desired traits
Term
Natural Selection
Definition
process in which individuals that have certain heritable characteristics survive and reproduce at a higher rate than other individuals
Term
Homology
Definition
related species can have characteristics with an underlying similarity even though they may have very different functions
Term
homologous structures
Definition
represent variations on a structural theme that was present in their common ancestor
Term
adaptive radiations
Definition
periods of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill different ecological roles
Term
homeotic genes
Definition
determine such basic features as where a pair of wings and a pair of legs will develop on a bird
Term
heterochrony
Definition
change in the rate or timing of developmental events (growth rates of humans, and chimpanzee skull growth to humans)
Term
paedomorphosis
Definition
the once juvenile structures are now maturing much earlier, and causes offspring to appear very different from their ancestors
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