Download Name - Wsfcs

Name________________________
PERSONAL PEDIGREE PROJECT
Use your knowledge of pedigree construction to create a pedigree for your own family.
Please go back as many generations as you can determine, and include all relevant
grandparents, aunt, uncles, cousins, etc. Draw your pedigree on a separate sheet of
computer or poster paper. Include the following:
1) Include a key for what the squares and circles, colored and non-colored mean. (10 pts)
2) In the space beneath each person in the pedigree (circle or square) write the first name
of each relative. Color them in if they have the trait you are tracking. (15 pts)
2) Below the relative’s name, write the probable genotype for that person. (15 pts if all
done correctly)
4) Pedigrees should be neat, colored, and have a title. (10 pts)
5) If you live apart from many of your relatives, try calling or emailing them to get info.
If you are adopted, don’t live with any genetic parent, or can’t complete a pedigree for
your own family, select a friend or neighbor’s family and construct your pedigrees using
their information.
Choose 1 of the following 4 traits:
A Hitchhiker’s thumb: People with two recessive alleles (hh) for hitchhiker’s thumb
can bend the distal joint of their thumb back so that it forms an angle of almost 45
degrees, causing the thumb to hyperextend. People with a homozygous dominant
genotype (HH) or a heterozygous genotype (Hh) cannot do this and would have a straight
thumb (or close to it) when the thumb is extended.
B Tongue rolling: Some people have the ability to roll their tongue into a distinct Ushape when they extend their tongue from their mouth. This ability to roll the tongue is
due to a dominant allele (RR or Rr) while those who have two recessive alleles (rr)
cannot roll their tongue.
C Mid-digital hair: The mid-digital hair trait is determined by a dominant allele (DD
or Dd) for each finger causing hair to grow on the top of that finger, in between the
middle and top finger joint. People who have no hair on any finger in between the
middle and top finger joint have a homozygous recessive genotype (dd).
D Widow’s peak: If a person has a distinct ‘V’ in the middle of his or her hairline at
the forehead, they have a widow’s peak and therefore carry a dominant allele (PP or Pp)
while a straight hairline is influenced by a homozygous recessive genotype (pp).