Transcript PEDIGREES

PEDIGREES
Pedigrees
• A pedigree chart is a diagram that shows
family inheritance of a particular trait.
Male versus Female
• Males are Square (just kidding ;)
– Represented by squares
• Females are represented by circles
First comes love, then comes
Marriage…
• A horizontal line connecting a male and
female represents a marriage
Kiddies
• A vertical line and bracket connect the
parents to their children
One child
multiple children
Shady characters
• A shaded square or circle indicates a
person that possesses that trait
• A square or circle that is not shaded
indicated the person does not have the
trait being studied
Labeling
•
•
In order to read a Pedigree, two numbering rules apply
– Generation- which is shown with Roman Numerals
– Individuals- which is shown with a number
These numbers can be used to identify individuals on the pedigree. For
Example, look at the pedigree and pick out: II-5
TRY IT
• Dave had 3 children with Martha. Sarah is
5, Doris is 3 and Daniel is 2. Martha, Doris
and Daniel have blue eyes
• Make the pedigree for blue eyes
• Check your answer on the next slide
Dave had 3 children with Martha. Sarah is 5, Doris is 3
and Daniel is 2. Martha, Doris and Daniel have blue eyes
I
1
Martha
2
Dave
II
1
Sarah
2
Doris
3
Daniel