Pedigrees
What is a pedigree?
 A pedigree is a genetic representation of a family tree that
diagrams the inheritance of a trait or disease through several
generations. The pedigree shows the relationships between family
members and indicates which individuals express or silently carry
the trait in question.
Rules for pedigrees
 Circles – females
 Squares – males
Rules for pedigrees
 Shaded in – exhibits the
trait
Rules for pedigrees
 Horizontal line connecting
two people – reproducing
together
 Vertical line from a
horizontal line – line of
decent, goes from one
generation to a second
generation
Rules for pedigrees
 There are two
ways to identify
individuals
Now you try it!
 Using your data you collected yesterday
create a pedigree for two of the traits
 Include a descriptive title for both pedigrees