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The three possible genotypes* for the ALDH2 gene and their associated phenotypes. Each person has a pair of chromosomes carrying the ALDH2 gene, one inherited from the mother and one from the father. The two chromosomes can carry either the same allele (homozygous) or two different alleles (heterozygous).
*For a definition of this term and others used in this figure, see central glossary, pp. 182–183.
