Gene - A specific length of a DNA molecule made up of a sequence of nucleotides which controls the production of a particular product, usually a protein; it occupies a fixed position, its locus on the chromosome, Allele - One of a number of alternative forms of a gene, each possessing a unique nucleotide sequence, only one of which can occur at a locus, Homozygous - Both alleles at a given locus on a homologous chromosome are identical, Heterozygous - The alleles at a given locus on a homologous chromosome are different, Dominant - An allele is described as such if it is expressed in the phenotype of the heterozygote, Recessive - such an allele is only expressed in the phenotype the in the presence of another identical allele, Codominant - When both alleles are expressed in the phenotype of the heterozygote, Genotype - The genetic constitution of an organism with respect to the alleles under consideration, Phenotype - The characteristics of an individual usually resulting from the interaction between the genotype and the environment in which development occurs, Pure Breeding - Two homozygous organisms of the same phenotype that only produce offspring of the same phenotype, True Breeding - Has been self-fertilised for many generations, always producing the same phenotype. It has a homozygous phenotype.,

Inheritance definitions

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