Variations On A Human Face Worksheet Template
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Variations on a Human Face
Materials: 2 pennies, chart on human traits
1. First determine which partner will toss for the male and which will toss for the female.
Each of you will get a penny.
2. Have the partner who is representing the male flip the coin, if the coin lands heads up, the
offspring is female, if tails, the offspring is male. What is the sex of your offspring?______
3. For all coin tosses from now on. Heads will represent the dominant allele and tails will represent the
recessive allele. For each trait on the chart you will flip a coin to determine what GENOTYPE your offspring
will have. Put a check in the box that represents your offspring.
Example: For Shape of Face – Your partner tossed heads, and you tossed tails. That means your offspring’s genotype is Rr, and the child will have a
round face. You would check that box. If you had instead both tossed tails, the child would have a square-shaped face (rr). If you’d both tossed heads, the
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child would have a round shaped (RR) face
Coins should be flipped only once for each trait.
Po lygeniC Traits
– some traits are controlled by more than two genes and are called polygenic. Hair, eye color and
skin color are examples of polygenic traits.
Hair Color -- Dark hair is dominant over light. To determine the color of the offspring’s hair, assume there are
two gene pairs involved (there are actually probably more than that, but for the purpose of this activity, let’s not
go crazy). Flip your coin first to determine the genotype of the first pair of alleles (AA, Aa, or aa). Now, flip
the coins again to determine the genotype of the second pair of alleles (BB, Bb, or bb). Match the genotype you
have to the hair color on the chart. Circle your offspring’s 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
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