NAME:________________________PERIOD:_____DATE:_______________
BIKINI BOTTOM GENETICS
DIRECTIONS: Scientists at Bikini Bottoms have been investigating the
genetic makeup of the organisms in this community. Use the information
provided and your knowledge of genetics to answer each question.
1. For each genotype below, indicate whether it is a heterozygous or
homozygous dominant or homozygous recessive genotypes. Write
“hetero” for heterozygous and “homo D” for homozygous dominant or
“homo R” for homozygous recessive.
a. TT___________
b. Dd___________
c. Bb___________
g. Ff___________
h. bb___________
i. tt___________
d. ff___________
e. DD___________
j. BB__________
k. dd__________
f. Tt___________
l. FF__________
2. Determine the phenotype for each genotype using the information
provided about SpongeBob.
Yellow body color is dominant over blue body color.
a. YY____________________________
b. Yy____________________________
c. yy____________________________
Square shape is dominant over round shape.
a. SS___________________________
b. Ss___________________________
c. ss___________________________
3. For each phenotype, give the possible genotypes for Patrick.
Tall head (H) is dominate to short head (h).
a. Tall____________
b. Short_______
Pink body is dominant (P) over Yellow body (p).
a. Pink body________
b. Yellow body___
4. SpongeBob SquarePants recently met SpongeSusie RoundPants at a
dance. SpongeBob is heterozygous for his square shape, but
SpongeSusie is round. Use the Punnett square below to determine the
possible offspring of SpongBob and SpongeSusie.
a. Offspring phenotypes:______________________________
b. Offspring genotypes:________________________________
c. What are the chances of having an offspring with square pants?
________________________
%
d. What are the chances of having an offspring with round shape?
________________________
%
5. Patrick met Patti at the dance. Both are heterozygous for their pink
body color. Use the Punnett square below to determine the possible
offspring of Patrick and Patti.
a. Offspring phenotypes:______________________________
b. Offspring genotypes:_______________________________
c. What are the chances of having an offspring with pink skin?
________________________
%
d. What are the chances of having an offspring with yellow skin?
________________________
%
6. Everyone in Squidward’s family has light blue skin (B), which is the
dominant trait for body color in his hometown of Squid Valley. His
family brags that they are a “purebred” line. He recently married a
nice girl who has light green skin (b), which is a recessive trait. Use
the Punnett square below to determine the possible offspring of
Squidward and his new bride.
a. Offspring phenotypes:______________________________
b. Offspring genotypes:_______________________________
c. What are the chances of having an offspring with light blue skin?
________________________
%
d. What are the chances of having an offspring with light green skin?
________________________
%
7. Assume that one of Squidward’s sons, who is heterozygous for the light
blue body color, married a girl that was also heterozygous. Use the
Punnett square below to determine the possible offspring of Squidward’s
son and his new bride.
a. Offspring phenotypes:______________________________
b. Offspring genotypes:_______________________________
c. What are the chances of having an offspring with light blue skin?
________________________
%
d. What are the chances of having an offspring with light green skin?
________________________
%
8. Mr. Krabbs and his wife recently had a Lil’ Krabby, but it has not been
a happy occasion for them. Mrs. Krabbs has been upset since she first
saw her new baby who had short eyeballs. She claims that the hospital
goofed and mixed up her baby with someone else’s baby. Mr. Krabbs is
homozygous for his tall eyeballs, while his wife is heterozygous for her
tall eyeballs. Some members of the family have short eyes, which is
the recessive trait. Use the Punnett square below to determine the
possible offspring of Mr. and Mrs. Krabbs.
a. Offspring phenotypes:______________________________
b. Offspring genotypes:_______________________________
c. Did the hospital make a mistake?_________
d. Explain your answer to letter “c”.
____________________________________________________
____________________________________________________
____________________________________________________
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