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Evolution
NA
35
Biology
9th Grade
01/26/2013

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Term
Relative Dating
Definition
Comparing layers of sedimentary rocks.
Term
Spontaneous generation
Definition
A belief that living things could arise from nonliving things.
Term
Radiometic dating
Definition
Using radioactive decay to determine how old a object might be.
Term
Endosymbiosis
Definition
One bacterium engulfed another, which survived inside the other.  Both benefit from the arrangement.
Term
Evolution
Definition
Change over time
Term
Genetic variations in a species might result from:
Definition
gene shuffling and mutations
Term
Natural selection
Definition
Survival of the Fittest
Term
Fitness
Definition
The ability of an individual organism to survive and reproduce in it specific environment.
Term
Descent with modification
Definition

Species have descended with changes from other species over time.

 

Term
common Descent
Definition
All living things are derived from a common ancestor.
Term
Homologous structure
Definition

Structures that have different forms but have the same embryonic tissue.

Same structure, different function.

Term
Analogous structure
Definition
Same function, different structure.  Example:  moth and bird.
Term
Vestigial organ
Definition
Organs that are reduced in size which are traces of homologous organs found in other organisms.
Term
Embryology
Definition
Embryo similarities in the beginning stages of life.
Term
Microevolution
Definition
Change in the collective genetic material of a population.
Term
Relative frequency
Definition
The number of times an allele occurs in a gene pool compared with the number of times other alleles occur.
Term
Artifical Selection
Definition
Where a person would breed plants or organisms for certain desirable traits.
Term
Adaptation
Definition
Any inherited characteristic that increases an organism chance of survival.
Term
Phylogeny
Definition
The evolutionary history of a species or taxonomic group.
Term
Gene pool
Definition
All of the genes of the reproductively active members of a population.
Term
Stabilizing selection
Definition
Individuals with the average from of a trait have the highest fitness.
Term
Disruptive selection
Definition
Individuals with either extreme variation of a trait have greater fitness than individuals with the average from of the trait.
Term
Directional Selection
Definition
Individuals that display a more extreme form of a trait have greater fitness than individuals with average from of a trait.
Term
Genetic drift
Definition

Random change in the allele frequency often producing offspring that will be different from the original population by chance.

 

Term
Founder effect
Definition
Change in allele frequencies as result of the migration of a small subgroup of population.
Term
Hardy-Weinberg principle
Definition
The frequency of alleles in a population does not change over generations unless outside forces act on the population.
Term
Speciation
Definition
Formation of a new species.
Term
Morphology
Definition
The use of internal and external structure and appearance of an organism to classify a species.
Term
Reproductive isolation
Definition
Where populations becomes isolated from each other.  Example Hawaii Fruit flies
Term
Behavior isolation
Definition
Occus when two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding.
Term

Allopatric speciation

(Geographic isolation)

Definition
Populations are separated physically geographic barriers such as rivers, mountains or stretches of water.
Term
Temporal isolation
Definition
Populations reproduce at two different times.
Term
Sympatic Speciation
Definition
Occurs when two subpopulations becomes reproductively isolated within the same geographic area.
Term
Gradualism
Definition
Rate of speciation that occus at a regular, gradual rate.
Term
Punctuated
Definition
Rate of speciation that causes sudden rapid change.
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