Pedigree Analysis

1. Pedigree Analysis

2. Generations appear in rows, indicated by a successive Roman numeral • Individuals in each family are listed across the rows, in birth order • Males are squares, females are circles • Affected individuals are shaded, unaffected individuals are not shaded (in sex-linked traits, carriers can be half-shaded) Pedigree Structure

3. Pedigrees can be analyzed to determine if a trait is: • Autosomal & dominant • Autosomal & recessive • Sex-linked & dominant • Sex-linked & recessive Inheritance Patterns

4. Recessive traits can skip generations • Sex-linked traits affect males more frequently than females Hints

5. Can you determine the genotype of the individual shown?

11. Can you draw a pedigree for the man in the song? • Now many, many years ago when I was twenty-threeI was married to a widow who was pretty as can beThis widow had a grown-up daughter who had hair of redMy father fell in love with her and soon they too were wedThis made my dad my son-in-law and changed my very lifeMy daughter was my mother 'cause she was my father's wifeTo complicate the matter even though it brought me joyI soon became the father of a bouncing baby boyMy little baby then became a brother-in-law to DadAnd so became my uncle, though it made me very sadFor if he was my uncle, then that also made him brotherOf the widow's grown-up daughter who was also my stepmotherFather's wife then had a son who kept them on the runAnd he became my grandchild, for he was my daughter's sonMy wife is now my mother's mother and it makes me blueBecause although she is my wife, she's my grandmother tooNow if my wife is my grandmother, then I'm her grandchildAnd every time I think of it, it nearly drives me wildFor now I have become the strangest case I ever sawAs husband of my grandmother, I am my own grandpa I am my own grandpa