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26
Biology
10th Grade
01/18/2011

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Term
population genetics
Definition
the study of eveolutoon from a genetic point of view
Term
bell curve
Definition
shape of the curve looks like a bell
Term
microevolution
Definition
a change in the collective change in genetic material in a population
Term
gene pool
Definition
the total genetic information available in a population
Term
Allele Frequency
Definition
dividing the certain number of alleles by the total number of alleles
Term
pheotype frequency
Definition
equal to the number of individuals with a particular phenotype
Term
hardy weinburg genetic eqqullibrium
Definition
based on a set of assumptions about an ideal hypothetical population
Term
immigration
Definition
movement to a new population
Term
emigration
Definition
movement out of a population
Term
gene flow
Definition
process of genes moving from one place to another
Term
genetic drift
Definition
phenomonon by which allele populations change
Term
sexual selection
Definition
females tend to chose males as mates
Term
stablizing selection
Definition
individuals with the average form of a trait have the highest fitness
Term
Disruptive Selection
Definition
individuals with either extreme variation of a traid have greater fitness then individuals with the average form of the trait
Term
directional selection
Definition
individuals that display a more extreme form of a trait
Term
speciasion
Definition
species formation
Term
morphology
Definition
internal and extermanl appearence of an organism
Term
biological species concept
Definition
proposed by Ernst Mayr
Term
Geographic Isolation
Definition
the physical separation of members of a population
Term
allopatric sepciation
Definition
when species arise of a result of geographic isolation
Term
reproductive isolation
Definition
results from barriers to successful breeding between population groups in the same area
Term
Prezygotic isolation
Definition
premating isolation
Term
postzygotic isolation
Definition
postmating isolation
Term
symptric speciation
Definition
when 2 subpopulations become reproductively isolated within the same grographic area
Term
gradualism
Definition
that speciation occurs at a regular gradual rate
Term
puntuated equlibrium
Definition
pattern of species
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