Gene, a sequence of DNA that codes for a protein, Allele, an alternative version of a gene, Phenotype, the appearance of an organism, for example whether a pea is tall or dwarf, Genotype, the combination of alleles that an organism has for a particular gene, Homozygous, an organism with two of the same allele in the genotype, Heterozygous, an organism with two different alleles in its genotype, Dominant, an allele that you only need one of to determine the phenotype, Recessive, an allele that you need two copies of to determine the phenotype

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