POD 2/13 or 2/14

1
POD 2/13 or 2/14

• 1. What is a trait?
• 2. What is a dominant trait?
• 3. What is a recessive trait?

2
Do you have these Traits?

• Attached Earlobes
• Tongue Rolling
• Dimples
• Right-Handed
• Freckles
• Straight Hair
• Cleft Chin
• Allergies
• Hitchhikers Thumb
• Widows Peak

3
Problem
Inventory of My Traits Lab

• Are dominant traits or recessive traits more
  common?

Hypothesis

• If people are surveyed about their traits, then
  we will learn
• Dominant traits are more common
• More people have traits that are recessive
• Etc.

4
Method

1. Take Survey.
2. Graph the class results of the survey.
3. Graph the percent of people in the general
   population with the trait.

5
Data
Trait My Answer Class Yes Class No
Attached Earlobes
Tongue Rolling
Dimples
Right-Handed
Freckles
Straight Hair
Cleft Chin
Allergies
Hitchhikers Thumb
Widows peak
6
Class Graph
Number of Students in Class with Trait
Dimples
Attached Earlobes
Hitchhikers Thumb
Tongue Rolling
Right Handed
Freckles
Straight Hair
Cleft Chin
Allergies
Widows Peak
7
General Population Graph
Percent of People in General Population with Trait
Hitchhikers Thumb 25
Tongue Rolling 70
Right Handed 93
8
Dominant or Recessive
Trait (Phenotype) Dominant or Recessive Possible Genotype
Attached Earlobes
Tongue Rolling
Dimples
Right-Handed
Freckles
Straight Hair
Cleft Chin
Allergies
Hitchhikers Thumb
Widows peak
Recessive
Dominant
Dominant
Dominant
Dominant
Recessive
Dominant
Recessive
Recessive
Dominant
9
Conclusion

• Which dominant traits are more common?
• Which recessive traits are more common?
• Are dominant traits or recessive traits more
  common (in general)?