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Chapter 16
Chapter 16
18
Biology
11th Grade
10/20/2013

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Term
Allopatric Speciation
Definition
The formation of new species due to the physical separation of two groups
Term
Allopolyploid
Definition
An organism with multiple chromosomes sets resulting from mating of individuals of different species
Term
Autopolyploid
Definition
An organism with multiple chromosome sets
Term
Background Extinction
Definition
The steady, gradual loss of a small percentage of existing species through natural competition or loss of diversity
Term
Behavioural Isolation
Definition
A form of reproductive isolation based upon differences in behaviour, such as mating rituals
Term
Clad
Definition
A group of similar organisms sharing a set of traits derived from a common ancestor
Term
Ecological Isolation
Definition
A form of reproductive isolation based upon differences in habitat
Term
Gradualism
Definition
Slow evolutionary change
Term
Impact Theory
Definition
Proposed theory for mass extinctions caused by impacts of extraterrestrial origin
Term
Mass extinctions
Definition
the abrupt loss of many species over a wide area
Term
Parapatric Evolution
Definition
the formation of a new species at the boundary zone between two species
Term
Phylogeny
Definition
Evolutionary relationship between species
Term
Plate Tectonics
Definition
The movement of land masses resting on plates floating on molten rock
Term
Postzygotic Reproductive Isolation
Definition
The separation of species due to nonviability of an embryo or offspring
Term
Prezygotic Reproductive Isolation
Definition
The separation of species due to factors that prevent the formation of a zygote
Term
Punctuated Equilibrium
Definition
The view that life's history has had periods of little change interrupted by bursts of rapid change
Term
Sympatric Speciation
Definition
The formation of a new species within the boundaries of a parent species
Term
Temporal Isolation
Definition
A form of reproductive isolation based on differences in the timing of interactions
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