Genotype - The combination of alleles that an organism possesses usually represented by letters., Phenotype - The physical appearance of a characteristic in an organism, determined by the genotype., Allele - Different forms of a gene, Homozygous - A genotype in which two alleles for a characteristic are the same e.g. EE or ee., Heterozygous - A genotype in which two alleles for a characteristic are different e.g. Ee., Continuous - Type of variation when characteristics have a range of values which can be measured e.g. height, weight, Discrete - Type of variation when characteristics can be organised in to clear-cut groups e.g. eye colour, blood type., Dominant - A form of a gene that is always expressed in the phenotype., Recessive - A form of a gene that is only expressed if there are two copies of the gene., Polygenic - A type of inheritance where the phenotype is influenced by more than one gene. Usually gives rise to continuous variation, Single gene - A type of inheritance where the phenotype is influenced by only one gene. Gives rise to discrete variation, Variation - The difference in characteristics that can be seen between individual members of a species., P/F1/F2 - The three generations in a monohybrid cross,

Genetics Definitions

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