Bikini Bottom Genetics
Scientists at Bikini Bottom 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. Fill out the chart below with the requested information.
Genotype
TT
Bb
DD
Ff
tt
dd
Dd
ff
Tt
bb
Heterozygous (He) or
Homozygous (Ho)
Ho
Dominant (Dom) or
Recessive (Rec)?
Dom
Purebred (Pure)
or Hybrid (Hyb)
Pure
2. Use the information provided below, and fill out the chart below with the
requested information.
Trait
Dominant Gene
Recessive Gene
Body Shape
Squarepants (S)
Roundpants (s)
Body Color
Yellow (Y)
Blue (y)
Eye Shape
Round (R)
Oval (r)
Nose Style
Long (L)
Stubby (l)
Description
heterozygous for body shape
purebred (dominant) for nose style
homozygous recessive body color
homozygous dominant for body color
hybrid for nose style
homozygous dominant for body shape
homozygous recessive for nose style
heterozygous for eye shape
purebred (recessive) for body shape
heterozygous for body color
homozygous dominant for eye shape
Genotype
Ss
Phenotype
squarepants
3. SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance.
SpongeBob is heterozygous for his square shape, but SpongeSusie is round.
Create a Punnett square to show the possibilities that would result if
SpongeBob and SpongeSusie had children. Square shape (S) is dominant over
round (s).
A. List the possible genotypes and phenotypes for their children.
Genotype
Phenotype
B. What are the chances of a child with a square shape? ____%
C. What are the chances of a child with a round shape? ____%
4. Patrick met Patti at the dance. Both of them are heterozygous for their pink
body color (P), which is dominant over yellow body color (p). Create a Punnett
square to show the possibilities that would result if Patrick and Patti had
children.
A. List the possible genotypes and phenotypes for their children.
Genotype
Phenotype
B. What are the chances of a child with a pink body? ____%
C. What are the chances of a child with yellow body? ____%
5. Everyone in Squidward’s family has light blue skin (B), which is the dominant
over green skin (b) in his town. His family brags that they are all “purebreds.”
He recently married a nice girl who has light green skin. Create a Punnett
square to show the possibilities that would result if Squidward and his new
bride had children.
A. List the possible genotypes and phenotypes for their children.
Genotype
Phenotype
B. What are the chances of a child with light blue skin? ____%
C. What are the chances of a child with light green skin? ____%
D. Would all of Squidward’s children still be considered
purebreds? Explain! _________________________________
________________________________________________