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Chapter 24
Unit One
18
Biology
Undergraduate 2
09/10/2014

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Term
Speciation
Definition
Origin of new species lineage, splitting event that produces two or more spare species
Term
Macroevolution
Definition
Evolutionary change out or above species level over long periods of time
Term
Reproductive Isolation
Definition
Barrier that impacts two species from producing fertile offspring
Term
Prezygotic Barriers
Definition
Prior to fertilization, impede mating or hinder fertility, habit, temporal, behavioral
Term
Behavioral Barrier
Definition
Act different
Term
Habit Barrier
Definition
Different living situation
Term
Postzygotic Barriers
Definition
Prevent hybrid zygot from viable fertile adult
Term
Allopatric Speciation
Definition
Gene flow interrupted or reduced when population divided into geographical isolated subpops
Term
Adaptive Radiation
Definition
Rapid and frequent allopatric speciation following geographic and reproductive isolation
Term
Sympatric Speciation
Definition
Occurs in overlapping populations, exploiting a new nich
Term
Hybrid Zone
Definition
Region where closely related species meet, mate and reproduce
Term
Reinforcement Barrier
Definition
Barriers strengthen (less mating)
Term
Fusion Barrier
Definition
Barrier weakened (more viable mating)
Term
Stability Barrier
Definition
Continued hybrid mating
Term
Punctuated Equilibrium
Definition
Speciation takes place in short period of time followed by long period of stasis
Term
Gradualism
Definition
Species descend from common ancestor gradually diverging as unique adaptions acquired
Term
Separation Rates
Definition
Difficult to determine, favors high speciation
Term
Consequences of Speciation
Definition
New species, extinction of old, reproductive isolation
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