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Introduction to Pedigrees

Author(s): Lisa M. Meffert, PhD

Pedigree Diagrams: II

Basic Symbols for Offspring and Expression of a Trait - When drawing pedigrees, certain conventions are followed to depict offspring and their characteristics. The lines emanating from the mating line identify the offspring in the next generation. In this pedigree, the mating produced one son and one daughter.

A solid black symbol indicates the expression of the trait in question. In the pedigree above, only the son expresses the trait.