gene - A sequence of bases in a molecule of DNA, or a section of a chromosome , allele - An alternative form of a gene , homozygous - Both alleles are the same version of the gene, heterozygous - Different alleles of the gene, genotype - The genes possessed, phenotype - A description o how the genotype is expressed, e,g, tall, short, dominant gene - Always expressed in the phenotype, recessive gene - Only expressed in the phenotype when homozygous,

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