Homozygous - Two of the same Alleles in a chromosome pair, Heterozygous - Two different Alleles in a chromosome pair, Dominant Allele - Variation of a gene that is always expressed, even in the presence of other alleles, Recessive Allele - Variant of a gene that is not expressed if another allele is present. There must be two of the allele for the characteristic to be expressed., Gene - A short part of the DNA strand that codes for a particular characteristic, Chromosome - A long strand of DNA, made up of multiple genes, Allele - Different versions of the same gene, Phenotype - The physical characteristic you observe, Genotype - The genes that determine the characteristic,

Genetics definitions

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