Allele - An alternative version of a gene, Codominant - Characteristic where both alleles contribute to the phenotype, Continuous Variation - Genetic variation, also called quantitative variation, where there is a wide range of phenotypic variation within the population. There are no distinct categories. It is controlled by many genes. Examples include height in humans, Discontinuous Variation - Also called qualitative variation. Genetic variation where there are distinct phenotypic categories. Usually controlled by one gene. Examples include Cystic Fibrosis, shape of earlobes in humans and height in pea plants, Dominant - Characteristic in which the allele responsible is always expressed in the phenotype if it is present even in those with heterozygous phenotypes, Gene - A length of DNA that codes for one (or more) polypeptides/proteins. Some genes code for RNA and regulate other genes, Genotype - The alleles present within an individual for a particular trait/characteristic, Phenotype - The observable characteristic expressed in an organism, Recessive - Characteristic in which the allele responsible is only expressed in the phenotype if there is no dominant allele,

Patterns of Inheritance Key words 1

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