GENETICS WITH A SMILE Adapted from: Genetics with a smile by T
Name: ____________________________________________ Date: _______ Period: ____
GENETICS WITH A SMILE
Part A: Smiley Face Traits 1. Using 2 coins, you and your partner will each represent one parent in this lab. The oldest person in your group will be the "male" and the youngest person in your group will be the "female". 2. For each trait, flip the coin for the parent you represent. - If the coin lands with heads up, it represents a dominant allele. - If the coin lands tails up it indicates a recessive allele. 3. Record the result for each parent by circling the correct allele (letter). Use the results and the Smiley Face. Traits page to determine the genotype and phenotype for each trait.
TRAIT
FEMALE
Face Shape C c
Eye Shape
E e
Hair Style
S s
Smile
T t
Ear Style
V v
Nose Style
D d
Face Color
Y y
Eye Color
B b
Hair Length
L l
Freckles
F f
Nose Color
R r
Ear Color
P p
MALE C c E e S s T t V v D d Y y B b L l F f R r P p
GENOTYPE
PHENOTYPE
Part B: Is it a boy or girl? To determine the sex of your smiley face, flip the coin for the male parent. Heads would represent X, while tails would be Y.
FEMALE
SEX
X X
MALE X Y
GENOTYPE
PHENOTYPE
Part C: Circle Each Trait! Use the Smiley Face Traits chart and your results from Part A to circle each drawing that represents your results from the data table in Part A.
SMILEY FACE TRAIT
FACE SHAPE
Circle (C)
Oval (c)
NOSE STYLE
long (D)
short (d)
EYE SHAPE
Separated (E)
Joined(e)
HAIRSTYLE
Straight (S)
Curly (s)
SMILE
Thin (T)
Thick (t)
EAR STYLE
pointed (V)
curved(v)
FACE COLOR
EYE COLOR
Yellow (Y) Green (y) HAIR LENGTH
Brown (B) Blue (b)
FRECKLES
Long ( > 1 inch) (L)
Present (F)
Short ( < 1 inch) (l) NOSE COLOR
Absent (f) EAR COLOR
Red (R)
Purple (P)
Orange (r)
Pink (p)
SEX
XX = female = pink bow in hair
XY = male = blue hat on head
Part D: Create Your Smiley Face! Use the chart results from Part C to create a sketch of your smiley face in the space below. You may use crayons, colored pencils, or markers to add appropriate color to your smiley face. Please use all of the space provided on this page.
Part E: WRAPPING IT UP Part I 1. How many dominant traits did your smiley face have? _________ 2. How many recessive traits did your smiley face have? _________ 3. What is the probability that a smiley face will have a green face, given that the parents were both
hybrids, Yy * Yy? _________ out of __________ or ________ %
Part F: Wrapping It Up Part II 4. How would the smiley faces change if one of the parents were homozygous dominant for all the
traits while the other was heterozygous?
5. How would the smiley faces change if one of the parents were recessive for all the traits while the other was heterozygous?
6. Grandma and Grandpa Smiley are heterozygous for the separated eye shape. If one of their heterozygous children married a girl with joined eyes, what percentage of their grandchildren should have separated eyes? What percent would have joined eyes? Create a Punnett square to help you find your answers.
7. Baby Smiley has curly hair, but neither of her parents do! Is this possible? Create a Punnett square to help you find your answer.
8. Aunt Smiley has the cutest pointed ears and would love to have children with pointed ears! What type of ears would her husband need to have in order for her to get her wish? Give the genotype and phenotype as part of your answer.
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