Gamete - another term for a sex cell e.g. egg or sperm, chromosome - long threads of DNA, gene - section of DNA that codes for a protein, allele - different version of a gene, dominant - an allele that is always expressed, represented by a capital letter, recessive - an allele that is only expressed when it is present twice, homozygous - when a person has two of the same allele, heterozygous - when a person has two different alleles, genotype - the alleles a person possesses for a particular characteristic, phenotype - the observable feature,

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