unit 5

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  • Created by: Amh
  • Created on: 18-03-13 11:43
Mutation
a permanent change in the amount or arrangement of a cells DNA
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Allele
An alternate form of the same gene
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Phenotype
The characteristics of an organism resulting from it's alleles
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Phenotypic variation
The total variation in the in the characteristics of an organism, usually visible.
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Population
A group of freely interbreeding indivduals of the same species occupying the same space and time
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Allele frequencies
The number of times an allele occurs within the gene pool
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Selective advantage
A variation that favors one organisms an advantage over another, making it more likely to survive.
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Evolution
A change of the allele frequency in the gene pool
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Intraspecific competion
Competition between organisms of the same species
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Natural selection
The process by which the best adapted organisms in a population survive, reproduce and pass on their alleles to their offspring
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Speciation
The process by which new species develop
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Reproductive isolation
When groups within the population become isolated from one another and cannot interbreed
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Geographical isolation
The isolation of populations of a species by a physical barrier such as a river
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Allopatric isolation
Occurs when populations are prevented from innterbreeding because they become geographically isolared
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Sympatric isolation
Occurs when populations living together become reproductivley isolated
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Community
All the living things in an ecosystem at any given time
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Biotic factors
An ecological factor which makes up part of the living environment of an organism e.g. competition
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Abiotic factors
An ecological factor that makes up part of the non-biological environment of an organism e.g temperature
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Ecosystem
The interaction of a community, made up of all the biotic and abiotic components in a specific area
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Habitat
The area where an organism lives
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Biodiversity
an area where lots of different populations (of multiple species) reside
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Ecological niche
The ecological role of an organism in it's ecosystem
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Carrying capacity
Population size
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Limiting factors
Keep thhe population at the maximum size that an ecosystem can support
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Environmental resistance
The collective term for limiting factors and carrying capacity
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Density-dependent factors
A type of limiting factor that has greatest effect on a larger ppopulation. They are usually biotic, such as disease.
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Density independent factors
A type of limiting factor that will have a similar effects regardless of size. They are usually abiotic factors such as fire
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Genetically modified (organism)
Organisms that have been scientifically altered to have specific characteristics
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Transgenic
The term given to any animal whose genetic composition has been altered by the addition of foreigne DNA
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Interspecific variation
Competition between organisms of different species
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Other cards in this set

Card 2

Front

An alternate form of the same gene

Back

Allele

Card 3

Front

The characteristics of an organism resulting from it's alleles

Back

Preview of the back of card 3

Card 4

Front

The total variation in the in the characteristics of an organism, usually visible.

Back

Preview of the back of card 4

Card 5

Front

A group of freely interbreeding indivduals of the same species occupying the same space and time

Back

Preview of the back of card 5
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