What are the symbols used in the human pedigree analysis?

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter4: Pedigree Analysis In Human Genetics
Section: Chapter Questions
Problem 1QP: Pedigree Analysis Is a Basic Method in Human Genetic: What are the reasons that pedigree charts are...
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What are the symbols used in the human pedigree analysis?

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Step 1

Pedigree images show the genotypes or phenotypes of a particular organism and its ancestors. These pedigree diagrams are usually used in human families as they are helpful in tracking genetic disorders. Geneticists use a particular set of symbols to mark the individuals gender, relations in the family and phenotype. 

 

Step 2

These diagrams determine the mode of inheritance of a particular trait or disease. They also predict the probability of appearance of disease among the offspring. Therefore, pedigree analysis is very helpful in both basic and genetic counselling.

 

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