Name:
_
Per: D ate:
Genetic Inheritance
Part A: Determining Traits
1) Work with a partner to determine the possible genotype of a child with parents who are
heterozygous for all of the traits listed below.
2) Each partner should flip a coin to represent the allele passed on from either the mother
or the father. If the coin lands heads up, it represents a dominant allele. A coin that lands
tails up represents a recessive allele. Record the result for each parent by circling the
correct letter in the chart below.
3) Use the results to determine the genotype (combination of genes) and phenotype
(physical manifestation) for each trait.
---
-
Trait
F ace Sha
r
I
---j
Female
C
L
C
Eve Shane
1
e
E
Hair Stule
s
s
c.:
Genotype
Male
,
,;
T
Ear Stvle
t-°
\"
\"
\"
Nose St le
D
Y
d
d
V
D
¥
B
h
1
b
L
I
t
\'
T
Eve Color
Hair Length
T
I'
I
Phenotype
-'
Smile
Face Color
I
Freckles
Nose Colr
1
F
R
Y
F
R
Ear Color
p
T
P
t
-
v
Part B: Is it a boy or girl?
1) To determine the sex of the child, flip the coin for the male parent. Heads represents 'X
and tails represents 'Y.'
Female.ale.
•
M
Genotype.
Phenotype
Se
---
X
----------
X
Y
Part C: Draw the Child!
1) Use the genotypes you determined in Parts A
and B to create a drawing of the child.
Analysis Questions
1) What is the difference between a person's genotype and phenotype?
2) What does it mean if a person is heterozygous for a trait?
3) List all the traits for which your child was heterozygous.
4) What does it mean if a person is homozygous for a trait?
5) List all the traits for which your child was homozygous.
6) Why did we only have the person representing the male flip a coin to determine the
child's gender?
7) Would you expect there to be more children with the dominant phenotype or recessive
phenotype? Why?
Face Shape
Circle (C)
Nose Style
Oval (c)
(/-----,\
"-_
Down D)
7
\/
)
/
Uy
(d)
l\
/
/
I
\
\
/
Eye Shape
Star (E)
Hair Style
Straight ($)
Blast (e)
Curly (s)
Face Color
Yellow (Y)
Ee Color
Green (y)
Red (b)
Hair Length
Long (L)
Freckles
Blue (B)
"
Short (D)
Present (F)
Absent (f)
Nose Color
Red (RR)
Orange (RY)
Yellow (YY)
Ear Color
Hot Pk (PP)
Purple (PT)
Teal (TD
111111
Smile
Thick T)
Thin (t)
V
Ear Style
Curved (V)
0
Pointed ()
Ser
To determine the sex. the flip the coin for
the male parent Heads equals X and tails
equal3 Y.
XX- Female - Add pink bow in hair
Y - Male- Add blue bow in hair