Variations On A Human Face Lab Page 2
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5Polygenic Traits
Some traits are controlled by more than one gene and are called polygenic. Hair, eye color and
skin color are examples of polygenic traits. To determine the color of your child’s hair and eyes,
you will flip your coins twice, once to represent the A gene, and once to represent the B gene.
Example: Flip 1
Head / Head
Flip 2 Head / Tail
Genotype
A A
B b
4. Hair Color -- What did you flip? Flip 1 ___________________ Flip 2 _______________
Possible genotypes and hair color.
If the genotype is….
The hair color is…
AABB
black
AABb
black
AAbb
red
AaBB
brown
Aabb
regular blonde
AaBb
brown
aaBB
dark blonde
aaBb
regular blonde
aabb
pale yellow blonde
5. Eye Color -- What did you flip? Flip 1 ___________________ Flip 2 _______________
If the genotype is….
The eye color is….
AABB
dark brown
AABb
dark brown
AAbb
brown
AaBB
brown with green flecks
AaBb
brown
Aabb
gray-blue
aaBB
green
aaBb
dark blue
aabb
light blue (hazel)
6. Skin Color – skin color is controlled by a lot of different genes that basically add together to
determine how dark the skin is and variations in tone. To simulate how skin color might be
determined. Flip a single coin 10 times. Each time the coin turns up heads, give your
offspring a point. Add your points together. 10 pts would be a very dark child and 1 pt would
be a very pale child. How many points does your child have?
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