Pedigrees

What do you think of when you hear the word Pedigree? Question: What do you think of when you hear the word Pedigree?

Pedigrees A tool used to trace inherited traits in humans A “family tree” for a specific trait A chart showing the presence or absence of a trait

Symbols on a pedigree chart: Circle = female Square = male

Symbols on a pedigree chart: A ½ shaded circle or square = a person who carries the trait A completely filled circle or square = a person who has the trait A circle or square that is NOT shaded = a person who is not a carrier or a person with that trait

Symbols on a pedigree chart: The vertical lines and brackets = connect the parents to their children A horizontal line = a marriage between a male and female

# of generations = % of individuals with warts= # of females = ; # of males = Is the trait dominant or recessive? #of carriers = Individuals effected by: Warts