Alternative versions of a gene - Alleles, Section of DNA that codes for a particular protein/characteristic - Gene, The two alleles the person has for a gene - Genotype, The physical characteristic or feature - Phenotype, The allele that is always expressed when present - Dominant Allele, The allele which is only expressed if the dominant allele is not present - Recessive Allele, The two alleles of a gene are the same - Homozygous, The two alleles of a gene are different - Heterozygous, Thread-like structures made of DNA that carry the code to make proteins - Chromosomes, The whole genetic make up of an individual - Genome ,

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