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Ecology
Ecology: Populations
19
Biology
10th Grade
03/13/2008

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Term
Polygenic Trait
Definition
A phenotype that is controlled by more than one allele.
Term
Normal Distribution
Definition
A bell-shape curved graph where the average is represented by the peak of the bell and the extremes are represented by the valleys.
Term
R-Strategist
Definition

A species whos' population reproduces and grows quickly when environmental conditions are ideal for reproduction.

 

*Short life-span, produce many offspring, reproduce early in life, mature quickly w/o the aid of their parents. 

Term
Population Size
Definition
The number of individuals in a population.
Term
K-Strategist
Definition

A species who's population growth is restricted by the population's carrying capacity.

 

*Long life-span, slow to mature, reproduce few offspring later in life. 

Term
Population Model
Definition
A graph that shows different variable relationships of a population.
Term
Dispersion
Definition

The spacial organization between members of a population.  The way they're spread out..

 

*One of three features affecting the future of a population.

1. Population Size

2. Population Density

3. Dispersion 

Term
Density-Dependent Resources
Definition

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Resources that are affected by the density of a population.  Dense populations will have scarce resources. 

Term
Population
Definition
A group of the same species who live together and interbreed.
Term
Carrying Capacity
Definition
The maximum population size an environment can hold.
Term
Population Density
Definition

The number of individuals living in a given area of a population.

 

*One of three features affecting the future of a population.

1. Population Size

2. Population Density

3. Dispersion 

Term
Directional Selection
Definition
The shifting of a normal distribution graph towards one of it's extremes due to a naturally selected polygenic phenotype.
Term
Non-Random Mating
Definition
When individuals mate with phenotypically similar individuals and these traits are consequentially selected.
Term
Density-Independent Resources
Definition

Resources that are not affected by varying population densities.

 

*Climate

*Weather 

Term
Demography  
Definition
The statistical study of populations.
Term
Genetic Drift
Definition

When a random, often devistating event, reduces a populations' numbers of individuals and perhaps kills off a rare allele that might be advantageous.

 

*An Evolutionary Force that affects the Hardy-Weinberg Principle (5) 

Term
Genetic Drift
Definition
The physical movement of individuals from one population to another which increases the variability of allele manifestations.
Term
Logistics Model
Definition
A population model that takes into account the affect of density-dependant resources.
Term
Stabilizing Selection
Definition
The narrowing of a normal distribution curve that occurs when the extremes die off and the average polygenic trait is selected.
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