Table 1.

Possible causes of discordance among patients with identical genotypes of disease-producing genes

Groups with discordanceEnvironmental
factors		Unlinked
genes		Linked
genes
Monozygotic twins X   
Siblings X X  
Unrelated persons X X X 
Groups with discordanceEnvironmental
factors		Unlinked
genes		Linked
genes
Monozygotic twins X   
Siblings X X  
Unrelated persons X X X 
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