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AP Bio Chapter 24, 9e
Vocab
14
Biology
12th Grade
11/12/2012

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Term
allopatric speciation
Definition
The formation of new species in populations that are geographically isolated from one another.
Term
allopolyploid
Definition
A fertile individual that has more than two chromosome sets as a result of two different species interbreeding and combining their chromosomes.
Term
autopolyploid
Definition
An individual that has more than two chromosome sets that are all derived from a single species.
Term
biological species concept
Definition
Definition of a species as a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups.
Term
hybrid
Definition
Offspring that results from the mating of individuals from two different species or from two true-breeding varieties of the same species.
Term
hybrid zone
Definition
A geographic region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.
Term
microevolution
Definition
Evolutionary change below the species level; change in the allele frequencies in a population over generations.
Term
polyploidy
Definition
A chromosomal alteration in which the organism possesses more than two complete chromosome sets. It is the result of an accident of cell division.
Term
reinforcement
Definition
In evolutionary biology, a process in which a process in which natural selection strengthens prezygotic barriers to reproduction, thus reducing the chances of hybrid formation. Such a process is likely to occur only if hybrid offspring are less fit than members of the parent species.
Term
reproductive isolation
Definition
The existence of biological factors (barriers) that impede members of two species from producing viable, fertile offspring.
Term
speciation
Definition
An evolutionary process in which one species splits into two or more species.
Term
species
Definition
A population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups.
Term
sympatric speciation
Definition
The formation of new species in populations that live in the same geographic area.
Term
ecological species concept
Definition
A definition of species in terms of ecological niche, the sum of how members of the species interact with the nonliving and living parts of their environment.
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