Pedigrees

Learn to analyze pedigree charts with this interactive worksheet! Decode genetic family trees and understand inheritance patterns.

Fill in the blanks using the drop-down word banks provided. 1. In pedigrees, circles represent females and squares represent males.2. In order to indicate marriages, a horizontal line is drawn to connect circles and squares. In order to indicate children, a vertical line is drawn that connects them together with their parents.3. When looking at a pedigree, if you see a half-shaded circle or square, that indicates the person is a carrier. On the other hand, fully shaded circles and squares represent affected individuals.4. Generations on a pedigree are always represented using roman numerals. Interpreting Pedigrees How many generations are shown in the pedigree? 1 2 3 4 Suppose the trait being tracked in the above pedigree is recessive. What is the genotype of the mother? AA aa Aa None of the above Suppose the trait being tracked in the above pedigree is recessive. What is the genotype of the father? *I AM NOT SHOWING YOU CARRIERS!* AA aa Aa None of the above Label the generations in the pedigree. *ROMAN NUMERALS!* I II III How many individuals are in the above pedigree? 9 10 6 3 How many males are affected by this gene? 2 4 3 1 How many females are affected by this gene? 2 4 6 8 How many children did the first generation have? 5 4 3 2 How many granddaughters did the first generation have? 3 1 4 2 Label the generations in the pedigree. *ROMAN NUMERALS!* I II III IV How many affected individuals are shown in the above pedigree? 2 3 5 4 In order for Individual IV-1 to have the gene, their parents had what genotype? AA Aa aa None of the above How are individuals III-4 and III-5 related? Niece Nephew Mom Son Grandma Grandson Cousins How are individuals I-1 and IV-1 related? Great Grandpa Great Grandson Mom Son Grandpa Grandchild Uncle Nephew Watch the video about Pedigrees to help you understand how a pedigree works.