Transcript Pedigree Review - Contact Ms. Bosse

• A family tree traces a family name and various family
members through successive generations.
• Through a family tree, you can identify the
relationships among your cousins, aunts, uncles,
grandparents, and great-grandparents.
• A pedigree is a family tree that traces an inherited trait.
• It is made up of a set of symbols that identify males
and females, individuals affected by the trait being
studied, and family relationships.
Pedigree Symbols
Ended Relationship
Line
Male
Relationship Line
Female
Parent/Children Line
Affected male
Affected female
Male carrier of a recessive trait
Female carrier of a recessive trait
• The generations are
identified in sequence by
Roman numerals
• Each individual is given a
number. It always begins
back at #1 for each
generation, moving left to right.
• If you are tracing
a simple
Dominant trait,
people will either
be shaded or they
won’t
• What would have to be the genotype of the people
that are not shaded if you are tracing a Dominant
trait?
• If you are tracing a Recessive trait, you will need to
shade in the people that have the trait, AND halfshade your known carriers.
Key to a pedigree.
Key
□
Male Relative
Ο
Female Relative
□Ο
□Ο
□Ο
□Ο
□
Relationship
Ended Relationship
Fraternal Twins
Those blessed with high anxiety
Deceased