Gene - A short section of DNA that controls our characteristics, Allele - Different versions of a gene, Dominant - Always expressed, even if only one copy is present, Recessive - Only expressed if there are two copies present, Homozygous - Two of the same alleles (e.g. TT or tt), Heterozygous - Two different alleles (e.g. Tt), Genotype - The alleles an organism has , Phenotype - The appearance of an organism,

Inheritance in Action - key words

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