Biology Unit 4 Definitions

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  • Created by: Kelly
  • Created on: 25-03-14 10:09
Habitat
The place where an organism lives
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Population
All the organisms of one species in a habitat
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Community
All populations of different species in a habitat make up a community
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Ecosystem
All the organisms living in a particular area and all the abiotic conditions
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Abiotic Conditions
Non-living features of an ecosystem
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Biotic Conditions
Living features of an ecosystem
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Niche
The role of a species within it's habitat
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Adaption
A feature that members of a species have that increases their chance of survival and reproduction
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Metabolic Pathway
A series of small reactions controlled by enzymes
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Phosphorylation
Adding phosphate to a molecule
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Photophosphorylation
Adding phosphate to a molecule using light
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Photolysis
The splitting of a molecule using light
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Hydrolysis
The splitting of a molecule using water
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Decarboxylation
Removal of carbon dioxide from a molecule
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Dehydrogenation
Removal of hydrogen from a molecule
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Redox Reactions
Reactions that involve oxidation and reduction
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Gene
A sequence of bases on a DNA molecule that codes for a protein, which results in a characteristic
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Alelle
One or more alternative versions for the same gene
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Genotype
The genetic constitution of an organism
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Phenotype
The expression of the genetic constitution and its interaction with the environment
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Dominant
An allele whos characteristic appears in the phenotype even when theres only one copy
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Recessive
An allele whos characteristic is only expressed in the phenotype if two copies are present
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Codominant
Alleles that are both expressed in the phenotype, neither is recessive
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Locus
The fixed position of a gene on a chromosome, alleles of a gene are found at the same locus on each chromosome
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Homozygote
An organism that carries two copies of the same allele
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Heterozygote
An organism that carries two different alleles
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Other cards in this set

Card 2

Front

All the organisms of one species in a habitat

Back

Population

Card 3

Front

All populations of different species in a habitat make up a community

Back

Preview of the back of card 3

Card 4

Front

All the organisms living in a particular area and all the abiotic conditions

Back

Preview of the back of card 4

Card 5

Front

Non-living features of an ecosystem

Back

Preview of the back of card 5
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