What is pedigree analysis.Give a diagrammatic representation of autosomal dominant trait and autosomal recessive trait?

Dear student,

Pedigree analysis is a method that utilizes a set of symbols to visualize or have a diagrammatic representation of the history of traits in a family of the organism.  Some uses of pedigree analysis: differentiate between autosomal and X linked , Y linked traits. Differentiate between dominant and recessive traits. 
Here are some of the symbols used. 
Autosomal dominant trait:

Autosomal recesssive trait: 

 

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