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13 terms

13 EVOLUTIONARY BIOLOGY TERMS TO KNOW

From the DemiDec 2008 Super Quiz Cram Kit
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Adaptive radiation
divergence of a common ancestor in a new environment
Allopatry
geographic seperation of species
Balancing selection
favors heterozygous organisms
Direct fitness
number of its own alleles that an organism passes to the next generation through reproduction
Directional selection
favors traits at one end of spectrum
Disruptive selection
favorts traits at both ends of spectrum
Exaptation
trait that has changed in purpose over time
Horizontal transfer
genetic transfer between different species
Indirect fitness
number of alleles identical to its own that an organism's relatives contribute to the next generation due to the organism's help
Macroevolution
affects entire species
Microevolutions
affects populations
Stabilizing selection
favors intermediate traits
Sympatry
ecological seperation and geographic unification of species