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Outreach - Summer Programs
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Class Activity: A
Plate Of Traits!
Objective:
To identify facial traits and illustrate how
specific traits are inherited from parents by "creating" a face.
Materials:
paper plates, coins, crayons/markers,
list of traits
Directions:
1. Divide class into pairs. Each pair of
students should have one paper plate, two coins, and a set of crayons or
markers.
2. First, each pair needs to determine the
gender of their face. Remember to tell students that the mother (egg cell)
always contributes an X chromosome! A father (sperm cell) can either
contribute an X or a Y. Therefore, the father's genetic contribution
determines gender. A student in each pair should flip a coin to determine
the father's contribution. Heads will be a boy (Y chromosome) and tails will
be a girl (X chromosome). Now, each pair can name their face.
3. For each trait, participants (one
representing the mother's contribution and the other the father's
contribution) should flip coins to determine the genetic combination. Heads
will always be the dominant gene (designated by a capital letter) and tails
the recessive gene (designated by a lower case letter).
For example:
For the first trait listed, face shape, if the coin flips are both heads the
two genes would be dominant (RR). Therefore, the trait would be a round face
shape. If the coin flips are one head and one tail, the genes would be one
dominant and one recessive (Rr) and the face shape would still be round. The
dominant gene is always expressed when it is present. If both coin flips are
tails, then both genes would be recessive (rr), and the face shape would be
square.
4. Students should continue to flip coins and
add traits to the face until the concept is illustrated. Add or delete from
the facial trait chart to simplify the activity for younger students or to
challenge older students.
5. When the activity is complete, each pair
of students will have a unique face - different from every other "plate
face" in the room - just like us!
|
Facial Traits |
|
Face Shape |
Round (RR, Rr) |
Square (rr) |
|
|
Hair Type |
Curly (CC) |
Wavy (Cc) |
Straight (cc) |
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Hair Color |
Black (BB) |
Brown (Bb) |
Blond (bb) |
|
Widow's Peak |
Present (WW, Ww) |
Absent (ww) |
|
|
Eye Placement |
Close (EE) |
Average Distance (Ee) |
Far Apart (ee) |
|
Eye Shape |
Almond (AA, Aa) |
Round (aa) |
|
|
Eye color |
Brown (BB) |
Hazel (Bb) |
Blue (bb) |
|
Eyelashes |
Long (LL, Ll) |
Short (ll) |
|
|
Eyebrow Color |
Very Dark (HH) |
Medium Dark (Hh) |
Light (hh) |
|
Eyebrow Thickness |
Bushy (BB, Bb) |
Fine (bb) |
|
|
Nose Size |
Big (NN) |
Medium (Nn) |
Small (nn) |
|
Nose Shape |
Rounded (RR, Rr) |
Pointed (rr) |
|
|
Dimples |
Present (DD, Dd) |
Absent (dd) |
|
|
Mouth Size |
Long (MM) |
Average (Mm) |
Short (mm) |
|
Lips |
Thick (LL, Ll) |
Thin (ll) |
|
|
Earlobe Attachment |
Free (FF, Ff) |
Attached (ff) |
|
|
Freckles on Cheeks |
Present (FF, Ff) |
Absent (ff) |
|
|
Freckles on Forehead |
Present (FF, Ff) |
Absent (ff) |
|
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NOTE: Some traits need to be determined
together, prior to drawing. For example, you cannot do eye color until you
determine eye placement and shape.
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