Download Upper Merion Area High School

Upper Merion Area High School
Biology I
Pedigree Lab
Name______________________________________
Background:
1. What is a pedigree?
2. Why is a pedigree done (two purposes)?
3. What is a carrier?
4. How is a dominant trait inherited, human example?
5. How is a recessive trait inherited, human example?
6. Describe how a co-dominant trait can be identified, give a human example?
7. Describe how a sex-linked trait can be identified, give a human example?
Purpose (why are we doing this pedigree?)
Hypothesis: (Write an if/then statement considering the trait of an individual what their parents
traits would have to be).
Materials:
Method: Using a fictious family description you are going to create their family pedigree. The
family will then be assigned a trait. You as a genetic councilor will identify how the trait was
inherited.
1. Using the family description draw the family pedigree.
Members of the same generation should be on the same horizontal line
All individuals must be labeled with their name.
2. Using the list of affected individuals identify (shade in) all the individuals with the
trait
Carriers or Heterozygous should be half shaded
3. Create a key that shows the normal, affected, and heterozygous individuals.
Data: Attach the pedigree chart, with the trait labeled, and key included.
Generations in line, neat
Individuals named
Pedigree is correct
Key and Trait on Pedigree
Individuals with trait identified
Carriers/Heterozygous identified
Analysis:
1. How many generations are there on your pedigree?
2. Who was:
Rowena to AnnetteCharles to TamiPenelope to MikeEthel to BernitoStu to FifiNancy to Luanne3. Name the trait, and describe how was the trait inherited (dominant, recessive, sex linked, or
co-dominance)?
4. Why do you think it was inherited by this method (three reasons)?
5. What was your hypothesis is it supported?