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Chapter 23 Key Terms
Bio 311D - Zhao
14
Biology
Undergraduate 3
09/25/2011

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Term
Population genetics
Definition
the study of allele frequency and change due to natural selection, gene flow, genetic drift, and mutations
Term
Population
Definition
a localized group of individuals that are capable of interbreeding and producing offspring
Term
Gene pool
Definition
the total number of genes of every individual in a population
Term
Hardy-Weinberg Theorem
Definition
states that allele frequencies will remain constant from generation to generation unless acted upon by other agents
Term
Microevolution
Definition
change in the allele frequency in a population
Term
Gene flow
Definition
the transfer of alleles from one population to another
Term
Genetic drift
Definition
a process in which chance events cause changes in allele frequencies
Term
Polymorphism
Definition
the idea that traits come in two or more forms
Term
Natural selection
Definition
a process where organisms with desirable traits are more likely to survive and reproduce than organisms with undesirable traits
Term
Bottleneck effect
Definition
Genetic drift that occurs when the size of the population is greatly reduced and the resulting population doesn't fully represent the original population
Term
Stabilizing selection
Definition
Shifts the population to the intermediates of the distribution
Term
Directional selection
Definition
Shifts the population to one extreme of the distribution
Term
Disruptive selection
Definition
Shifts the population to both ends of the distribution
Term
The 5 causes of microevolution
Definition
Mutations
Gene flow
Genetic drift
Natural selection
Nonrandom mating
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