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| Modern Genetic Analysis Chapter 4. The Inheritance of Genes Human Pedigree Analysis Figure 4-18. Pedigree of a rare recessive phenotype determined by a recessive allelea. Gene symbols normally are not included in pedigree charts, but genotypes are inserted here for reference. Note that individuals II-1 andII-5 marry into the family; they are assumed to be normal because the heritable condition under scrutiny is rare. Note also that it is not possible to be certain of the genotype in some individuals with normal phenotype; such individuals are indicated by A.

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