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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