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Evolution
Flashcards For Mrs. Messer's Biology Exit Exam
7
Biology
9th Grade
12/08/2008
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Term

Definition of

 

Homologous Structures

 Definition
Two or more structures having the same typical structure and position, that also suggest common ancestry.
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Definition of

 

Analogous Structures

 Definition
Structures found in various species that may have the same function, but have originated from somewhere different on the evolutionary chain.
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Definition Of

 

Vestigial Structures

 Definition

a vestigial structure is an apparatus that had a use in the past, but overtime evolved to have no use.

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Convergent Evolution

 Definition
A kind of evolution wherein organisms evolve structures that have similar (ANALOGOUS) structures or functions in spite of their evolutionary ancestors being very dissimilar or unrelated.
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Divergent Evolution

 Definition

The "tracing back" in species to their common ancestor, which can indicate how these organisms have diversified and diverged.

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Definition Of

 

Co-Evolution

 Definition
Two or more species having a close ecological relationship evolve together such that one species adapt to the changes of the other, thereby affecting each other's evolution.
Term

Describe How Natural Selection Works

 Definition
NATURAL SELECTION: A process in nature in which organisms possessing certain genotypic characteristics that make them better adjusted to an environment tend to survive, reproduce, increase in number or frequency, and therefore, are able to transmit and perpetuate their essential genotypic qualities to succeeding generations.
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