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Ch 16: Speciation

Holt Modern Biology Chapter 16

QuestionAnswer
Allele Frequency The percentage of an allele in a gene pool
Bell Curve Most of the individuals of a population have the average form of a trait while few individuals of a population have either of the extreme forms of a trait.
Gene Pool All the genes for all of the traits in a population
Hardy-Weinberg Genetic Equilibrium The stability of gene frequencies across generations
Phenotype Frequency A ratio stating the number of times a specific phenotype occurs in a population in a single generation
Population Genetics The study of evolution from a genetic point of view
Assortative Mating Selection of a mate based on the similarity of characteristics
Directional Selection One of the extreme forms of a trait have an adaptive advantage
Disruptive Selection Individuals with two extreme forms of a trait have an advantage
Emigration Movement of individuals out of a population
Gene Flow The movement of genes into or out of a population
Genetic Drift A shift in allele frequencies in a population due to chance
Immigration Movement of individuals into a population
Sexual Selection The preferential choice of a mate based on a specific phenotypic trait
Stabilizing Selection A type of natural selection in which the average form of a trait causes an organism to have an advantage in reproduction
Biological Species Concept Species is defined as organisms that look similar and produce fertile offspring
Geographic Isolation The physical separation of species
Morphology The study of the internal and external structure and form of an organism
Postzygotic Isolation A barrier to successful breeding that occurs after fertilization
Prezygotic Isolation A barrier to successful breeding that occurs before fertilization
Punctuated Equilibrium A theory that speciation occurs during brief periods of rapid genetic change
Reproductive Isolation The inability of formerly interbreeding organisms to produce offspring
Speciation The formation of new species
Created by: jmglbrt
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