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| Modern Genetic Analysis Chapter 4. The Inheritance of Genes Human Pedigree Analysis Figure 4-21. The human achondroplasia pheno-type, illustrated by a family of five sisters and two brothers. The pheno-type is determined by a dominant allele, which we can call D, that interferes with bone growth during development. Most members of the human population can be represented as d/d in regard to this gene. This photograph was taken upon the arrival of the family in Israel after the end of the Second World War. (UPI/Bettmann News Photos.)

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