Biology Unit 4 Definitions 0.0 / 5 ? BiologyAll Unit 4A2/A-levelAQA Created by: KellyCreated on: 25-03-14 10:09 Habitat The place where an organism lives 1 of 26 Population All the organisms of one species in a habitat 2 of 26 Community All populations of different species in a habitat make up a community 3 of 26 Ecosystem All the organisms living in a particular area and all the abiotic conditions 4 of 26 Abiotic Conditions Non-living features of an ecosystem 5 of 26 Biotic Conditions Living features of an ecosystem 6 of 26 Niche The role of a species within it's habitat 7 of 26 Adaption A feature that members of a species have that increases their chance of survival and reproduction 8 of 26 Metabolic Pathway A series of small reactions controlled by enzymes 9 of 26 Phosphorylation Adding phosphate to a molecule 10 of 26 Photophosphorylation Adding phosphate to a molecule using light 11 of 26 Photolysis The splitting of a molecule using light 12 of 26 Hydrolysis The splitting of a molecule using water 13 of 26 Decarboxylation Removal of carbon dioxide from a molecule 14 of 26 Dehydrogenation Removal of hydrogen from a molecule 15 of 26 Redox Reactions Reactions that involve oxidation and reduction 16 of 26 Gene A sequence of bases on a DNA molecule that codes for a protein, which results in a characteristic 17 of 26 Alelle One or more alternative versions for the same gene 18 of 26 Genotype The genetic constitution of an organism 19 of 26 Phenotype The expression of the genetic constitution and its interaction with the environment 20 of 26 Dominant An allele whos characteristic appears in the phenotype even when theres only one copy 21 of 26 Recessive An allele whos characteristic is only expressed in the phenotype if two copies are present 22 of 26 Codominant Alleles that are both expressed in the phenotype, neither is recessive 23 of 26 Locus The fixed position of a gene on a chromosome, alleles of a gene are found at the same locus on each chromosome 24 of 26 Homozygote An organism that carries two copies of the same allele 25 of 26 Heterozygote An organism that carries two different alleles 26 of 26
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