Class Inventory of Traits
Purpose: The purpose of this lab is to determine the frequency at which different traits occur in
our class, and to look for patterns in the traits occurrence.
Hypothesis: Create a table for the 13 traits for your initial hypothesis. Tell whether you think the
trait is dominant or recessive. After we gather class data, fill in a revised hypothesis.
Materials: Pencil, PTC paper, YOU, paper
Procedure:
1. Set up your lab report.
2. Fill in your personal answers on your Traits Survey.
3. Mrs.Golde will add results to the overhead.
4. Record the class data in your data section.
5. Using the data, predict which traits are dominant and which are recessive.
6. Answer the conclusion questions.
Data:
One table of your own results.
One table of the class data.
Remember…tables need titles.
Conclusion/Discussion:
What did you base your hypothesis on?
Were you right 100% of the time?
Are more common traits “better” than less common traits?
Are dominant traits more common than recessive traits?
Which trait surprised you with how many people had or didn’t have it?
**Conclusions must be complete sentences. You need to turn on your “science writing” side
of the brain for a conclusion. **
Traits Inventory
In column 1, record whether you have the trait or do not.
In column 2, record the # of students with the trait
In column 3, record the % of students with the trait
In column 4, tell if you believe the trait is dominant (D) or recessive (R)
Trait
PTC Tasting
Ability to
Tongue Rolling
Presence of
Mid-digital Hair
Blue Eye Color
Detached Ear Lobes
Presence of
Widow’s Peak
Presence of
Cleft Chin
Naturally Curly Hair
Hitchhiker’s Thumb
Presence of
Freckles
Presence of
Dimples
Left on top
Interlocking Fingers
Bent little finger
Do you have
the trait?
# with
trait
% with
trait
Dom or
Rec
Actual Dom or
Rec?