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Family Pedigree Extra Credit Project- 40 POINTS POSSIBLE
Introduction:
A pedigree is a family tree that shows the relationships among family members and traces a specific genetic
trait within the family.
By following a few guidelines, you can make a pedigree chart for your family. You might even be able to find a
pattern in the way a family characteristic is inherited.
Directions:
Using a poster board or large poster paper, create your family pedigree of one particular trait (either a known
genetic disorder in your family or a trait from the list below).
You must include the following elements:
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Must be completed on large poster paper
All lines and symbols straight, even, and neat—use a ruler!
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Title detailing what trait your pedigree shows
A legend showing symbols
Minimum of 3 generations, with at least 4 individuals in each generation (12 people minimum)
First names for all members
Generations labeled with Roman numerals and individuals labeled numerically 1, 2, 3….etc.
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Include a key that shows which letters are being used to represent the trait alleles and what the
possible genotypes are for each phenotype
Indicate people with the recessive form of the trait (shaded), carriers and people with the dominant
form of trait
Create a Punnett square of 2 people with known genotypes from your pedigree. List the genotypic
and phenotypic ratios/percentages.
Indicate the genotype of each person (If there are several possible genotypes, put a question mark
for that allele- Ex. For a unknown tongue roller T?)
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Possible traits:
Trait
Widow’s peak
Dimples
Freckles
Ear lobes
Hair on middle digit
Toe length
Tongue roller
Height
Females:
Males:
Curved Thumb
Cleft Chin
Roman Nose
Dominant
widow’s peak
Dimples
Freckles
Free ear lobes
Hair on middle digit
2nd toe longer
Tongue roller
Short
less than 5’7
less than 5’10
Hitchhiker thumb
No cleft Chin
Nose w/bump
Recessive
straight hairline
No dimples
No freckles
Attached
No hair on middle digit
Big toe longer
Non-tongue roller
Tall
5’7 or above
5’10 or above
Straight Thumb
Cleft Chin
Straight nose