Family Planning
Part 1: Parent Generation
1. Using the list of human mendelian traits, design a mother and father pair of humans.
Determine their genotype and phenotype for each trait.
Male:
Female:
Trait
Phenotype
Genotype
Chin (C)
CC
Cleft
Hairline (W)
Ww
Widow’s
peak
Dimples (D)
dd
No
dimpless
Trait
Phenotype
Genotype
Chin (C)
cc
No Cleft
Hairline (W)
Ww
Widow’s
peak
Dimples (D)
DD
dimples
Hair Color
(H)
HH
Brown hair
Hair Color
(H)
hh
Blonde
hair
Freckles (F)
Ff
Freckles
Freckles (F)
Ff
Freckles
Eye color
(E)
ee
Grey/blue
Eye color
(E)
EE
Brown
Earlobes (A)
AA
Free
Earlobes (A)
aa
attached
2. Given the Genotypes of the parents above, Complete a Punnett square for the outcomes
of each of their traits.
Chin:
Freckles:
Gametes
C
C
Gametes
F
f
c
Cc
Cc
F
FF
Ff
c
Cc
Cc
f
Ff
ff
Genotypic Ratio: 1:0
Phenotypic Ratio: 1:0
Genotypic Ratio:1:2:1
Phenotypic Ratio: 3:1
Hairline:
Eye Color:
Gametes
W
w
Gametes
e
e
W
WW
Ww
E
Ee
Ee
w
Ww
ww
E
Ee
Ee
Genotypic Ratio:1:2:1
Phenotypic Ratio: 3:1
Genotypic Ratio: 1:0
Phenotypic Ratio: 1:0
Dimples:
Earlobes:
Gametes
d
d
Gametes
A
a
D
Dd
Dd
A
AA
Aa
D
Dd
Dd
a
Aa
aa
Genotypic Ratio: 1:0
Phenotypic Ratio: 1:0
Genotypic Ratio: 1:2:1
Phenotypic Ratio 3:1
Hair Color:
Gametes
H
h
H
HH
Hh
h
Hh
hh
Genotypic Ratio: 1:2:1
Phenotypic Ratio: 3:1
:
Part 2: F1 Generation
3. Mom and dad have 4 children. For each offspring, you will flip a coin to determine which
gamete they receive from each parent. (Heads=dominant, Tails= recessive)
Child 1:
Chin:
Hairline:
Dimples:
Hair Color:
Freckles:
Eye Color:
Earlobes:
Child 3:
Cc
WW
Dd
hh
Ff
Ee
AA
Child 2:
Chin:
Hairline:
Dimples:
Hair Color:
Freckles:
Eye Color:
Earlobes:
Chin:
Hairline:
Dimples:
Hair Color:
Freckles:
Eye Color:
Earlobes:
Cc
ww
Dd
Hh
FF
Ee
Aa
Child 4:
Cc
WW
Dd
Hh
ff
Ee
Aa
Chin:
Hairline:
Dimples:
Hair Color:
Freckles:
Eye Color:
Earlobes:
Cc
Ww
Dd
HH
Ff
Ee
aa
Part 3: Statistics
4. For each child, calculate the statistical probability of each of their appearances.
(.25 chin x .5 hairline x.75 dimples…)
a. Child 1: 1 chin x .25 Hairline x 1 Dimples x .25 hair color x .5 freckles x 1 Eye
color x .25 earlobe
b. Child 2: 1 chin x .25 Hairline x 1 Dimples x .5 hair color x .25 freckles x 1 Eye
color x .5 earlobe
c. Child 3: 1 chin x .25 Hairline x 1 Dimples x .5 hair color x .25 freckles x 1 Eye
color x .5 earlobe
d. Child 4: 1 chin x .5 Hairline x 1 Dimples x .25 hair color x .5 freckles x 1 Eye color
x .25 earlobe
5. Did the children look how you expected them to? Explain.
Yes they all have both similar traits to each other and their parents but also have some
different phenotypes to distinguish them from each other.
6. Discuss the appearance of the family. Did the children share traits? How alike are they to
each other? To their parents? Would their Christmas pictures look like a family or a
poorly cast, staged catalog picture?
The children were very similar to eachother with only a few differences between
eachother but the parents would look different than the kids because the parents had more
mixed genotypes compared to the children.