AP Biology Pedigree Project
Using the information that you found out about your family and their traits, create a pedigree showing
how the traits were inherited. The following are the requirements for this pedigree.
• There must be two generations shown. If you are able to begin with your grandparent’s generation
and continue through 3 full generations, that is requested.
• You must have a minimum of 10 people in your pedigree. (All 10 people should also have the
traits you are choosing to use in your pedigree.) Please feel free to include more than 10!
Please note: if you do not have 10 family members, that is fine, please talk to me. We will figure
out what to do for your project.
Choose two traits from the ones you researched and create a separate pedigree for each trait. Try not
to pick traits where your pedigree would turn out exactly the same both times. Also, your position of
people in your pedigree can be the same, the difference will be how you shade or fill in the symbols
based on the people having or not having the trait, etc.
You can choose to follow either the dominant or recessive trait for each pedigree, shading in only the
dominant or recessive. Make sure you specify which one you are following.
• On your pedigree, include the following: generations I, II, and III, the numbers to indicate order
siblings were born, the genotypes of the people, and the individual’s names.
o Note- you might not know the genotypes for all people, especially if the person exhibits a
dominant trait. If you do not know the genotype if it is dominant, write the choices it could
be. For example: you would write “T*” or “TT or Tt” on your pedigree.
o For some people, you may be able to determine whether they are heterozygous or
homozygous dominant, by looking at their offspring. If that does not work, use the above
Rubric: This project is worth 65 points and will graded with the following rubric. Please take your time
and be as accurate as possible.
Rubric for Each Pedigree
Title on pedigree
Lines are drawn with a ruler and pedigree is NEATLY ORGANIZED
Minimum of 10 individuals
Symbols for the 10 individuals indicate male or female, and presence or absence of
Genotypes of all people are included
Names of people are included
Generation numerals and sibling order numbers are included correctly.
Packet with research completed and turned in
Total Points Earned
All pedigrees will be due on Friday, January 3rd !!
Tongue rolling is dominant to non-tongue rolling. Use “T” for your genotype.
Widow’s peak is dominant to non-Widow’s peak. Use “W” for your genotype.
Non-attached earlobes are dominant to attached earlobes. Use “E” for your genotype.
The presence of dimples is dominant to the absence of dimples. Use “D” for your genotype.
Eye color is more complicated because two genes control this feature. For our purposes, we will
simplify it slightly. Assume that the following: brown eyes are dominant to blue eyes and green
eyes, and green eyes are dominant to blue eyes. Use “B” to indicate brown eyes, “b” to indicate
blue eyes, and “G” to indicate green eyes. Examples:
o BB, Bb, or BG would have a phenotype of brown eyes.
o bb would have a phenotype of blue eyes.
o GG or Gb would have a phenotype of green eyes.
o Scientists do not yet know what causes hazel or gray eyes.
o If you choose to use eye color for one of your pedigrees, choose it only if at least 10 or 11
members have brown, blue, or green eyes. Do not choose this trait if many people have
hazel or gray eyes because we do not know what their genotype would be.