1. Pedigree Charts
Diane Philip

2. What is a Pedigree?
A pedigree is a chart of the genetic history of a family over several generations.
Scientists and genetic counselors use pedigrees to analyze family history.
Why do you think it would be useful to know your genetic history?
-see what the chances are of passing a disease or inheriting it

3. Reading a Pedigree Female: Male: Married:
A pedigree uses many different symbols to represent different things.

4. Reading a Pedigree Examples of connected symbols: Siblings:
Fraternal twins:
Identical twins:

5. Reading a Pedigree
Affected:
Normal:

6. Autosomal or Sex-linked?
What does autosomal mean? Refer to your notes if you need to.
What does sex-linked mean?
How can we figure out if this is autosomal or sex-linked?
-sex-linked should affect one sex more than the other.

7. Dominant or recessive? Is this a dominant or recessive trait?
Why?
If this was a dominant trait, what would be different?