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AP Biology
Evidence of Evolution Chapter 17
22
Biology
12th Grade
04/30/2011

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Term
species
Definition
Each kind of being (separate link on the chain)
Term
biogeography
Definition
the study of patterns in the geographic distribution of individual species and entire communities
Term
comparative morphology
Definition
the study of body plans and structures among groups of organisms
ex: bones in human arm,whale flipper differ in size,shape and function
Term
fossils
Definition
recognizable, physical evidence of an organism that lived in a distant past
Term
catastrophism
Definition
Idea that abrupt changes in the geological and fossil record are evidence of divinely invoked catastrophes
Term
Natural Selection
Definition
The outcome of differences in reproduction among individuals of a population that varying shared traits. Environmental agents of selection act as a range of variation, and the population may evolve as a result
Term
Fossilization
Definition
slow process that starts when an organism or traces of it become covered by sediments or volcanic ash; water slowly infiltrates the remains, and metal ions and other inorganic compounds dissolved in it replace the minerals in bones and other hardened tissues
Term
lineage
Definition
one line of descent
Term
stratification
Definition
the formation of sedimentary rock layers
Term
radiometric dating
Definition
way to measure proportions of a daughter isotope and the parent radioisotope of element trapped in a rock since the time the rock formed
Term
half-life
Definition
the time it takes for half the quantity of a radioisotope's atoms to decay
Term
geologic time scale
Definition
timescale for Earth's history; major subdivisions correspond to mass extinctions. Dates are now absolute as a result of radiometrically dating.
Term
macro evolution
Definition
large-scale pattens, rate of change, and trends among lineages
Term
Pangea
Definition
palezoic supercontinent;the first land plants and animals evolved on it
Term
Plate tectonics theory
Definition
Theory that great slabs or plates of Earth's molten layer float on a hot,semi-molten mantle. All plates are moving and have rafted continents to new positions over time
Term
Gondwana
Definition
a super-continent that preceded Pangea
Term
Homologous Structures
Definition
homo (meaning same) similarities in body parts between different groups pointing to a shared ancestry
Term
morphological divergence
Definition
Change from the body form of a common ancestor in a major macro-evolutionary pattern
Term
Morphological convergence
Definition
cases where dissimilarly body parts evolved in similar ways in the evolutionary distant lineages
Term
analogous structures
Definition
analogos (meaning similar to one another)
dissimilar body parts that become similar in structure, function or both in lineages that are not closely related but very subjected to similar pressures
Term
Nucleic acid Hybridization
Definition
refers to base-pairing between DNA strands from different sources
Term
molecular clock
Definition
Model used to calculate the origin of one lineage relative to others.Assumes that a group of genes accumulates mutations at a constant rate, measurable as a series of predictable ticks, back through time. The last tick stops close to the time the lineage originated
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