Pedigree Analysis

The holiday season can be a great opportunity to get genetic trait information about people you know or are related to. This project is fairly simple and requires you:

  1. Use 3 or more people that are related (2 parents and an offspring minimum) and analyze their phenotypes for 3 different traits.
  2. Produce 3 pedigrees for the traits (a separate pedigree must be drawn for each trait).
  3. Analyze whether you think each trait could possibly be dominant, recessive, or sex-linked.
  4. Explain your reasoning for your analysis.


                 Trait
 		 Your Phenotype / Genotype Class
frequency		 Class %
Attached ear lobe.      
Unattached ear lobe.       
Widows peak.      
Non widows peak.        
Tongue roller.       
Non tongue roller.       
Bent pinkie.      
Straight pinkie.       
Hair on mid joints.      
No hair on mid joints.       
Red hair.       
Any other color of hair.      
Long eyelashes.      
Short eyelashes.       
PTC taster.      
Non PTC taster.       
Round face.      
Square face.       
Cleft chin.       
Non cleft chin.      
Almond eyes.      
Round eyes.        
Eyes straight.      
Eyes slanted.       
Bushy eyebrows.      
Fine eyebrows.       
Connected eyebrow.       
Nonconnected eyebrow.      
Large ears.      
Small ears.        
Freckles.      
No freckles.       
Dimples.      
No dimples.       
Hitchhiker's thumb.      
Non hitchhiker's thumb.      
Right arm over left.      
Left arm over right.      
Cross right thumb over left      
Cross left thumb over right.      
Right handed.      
Left handed.       
Long fingers.      
Short fingers.       
Thick lips.      
Thin lips.       
color-blind      
color-vision      

Choose 3 of the above traits to analyze your family for.  You will produce a pedigree of the results for each trait you analyze.  Carefully take the data for this study in the following table:

Family Member Name Trait 1:_____________ Trait 2:_____________ Trait 3:_____________