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Bio Exam - Chapter 13
Terms and Essay Questions
16
Biology
Undergraduate 2
04/12/2010

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Definition
Descent with modification; the idea that living sepcies are descendants of ancestral species that were different from present-day ones; also the genetic changes in a population over generations.
Term
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Definition
A process in which organsims with certain inherited characteristics are more likely to survive and reproduce than are organisms with other characteristics.
Term
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Definition
The selective breeding of domesticated plants and animals to promote the occurrence of desirable traits.
Term
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Definition
An inherited characteristic that enhances an organism's ability to surivive and reproduce in a particular environment.
Term

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Paleontology

Definition
The study of human origins and evolution.
Term
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Definition
A method of determining the absolute ages of fossils and rocks, based on the half-life of radioactive isotopes.
Term
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Definition
Rock layers formed when new layers of sediment cover older ones and compress them.
Term
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Definition
The study of past and present distribution of organisms.
Term
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Definition
Structures in different species that are similar because of common ancestry.
Term
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Definition
A structure of marginal or no importance to an organism. Vestigial organs are historical remnants of structures that had imiportant functions in ancestors.
Term
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Definition
The study of the molecular basis of genes and gene expression; molecular genetics.
Term
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Definition
All the alleles for all the genes in a population
Term
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Definition
A change in a population's gene pool over generations.
Term
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Definition
A group whose members possess similar anatomical characteristics and have the ability to interbreed and produce viable, fertile offspring.
Term
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Definition
The transfer of alleles from one population to another, as a result of the movement of individualsor their gametes.
Term

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Definition
A change in the gene pool of a population due to chance; effects of genetic drift are most pronounced in small populations.
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