Name ______date ______per ______
Bikini Bottom Genetics
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 (He) OR homozygous (Ho).
TT _HO__ Bb _HE__ DD HO ___ Ff _ HE __ tt _ HO __ dd _ HO _
Dd _ HE _ ff _ HO __ Tt __ HE _ bb _ HO __ BB _ HO __ FF __ HO _
Which of the genotypes in #1 would be considered purebred? _All with HO______
Which of the genotypes in #1 would be hybrids? ___All with HE______
2. Determine the phenotype for each genotype using the information provided about SpongeBob.
Yellow body color is dominant to blue.
YY __Yellow___ Yy ___ Yellow ___ yy ____ Blue ____
Square shape is dominant to round.
SS __ Square ___ Ss ___ Square _____ ss __ Round ______
3. For each phenotype, give the genotypes that are possible for Patrick.
A tall head (T) is dominant to short (t).
Tall = __TT, Tt______Short = _____tt______
Pink body color (P) is dominant to yellow (p).
Pink body = _PP, Pp____ Yellow body = ___pp_____
Characteristic / Dominant Gene / Recessive GeneBody Shape / Squarepants (S) / Roundpants (s)
Body Color / Yellow (Y) / Blue (y)
Eye Shape / Round (R) / Oval (r)
Nose Style / Long (L) / Stubby (l)
4. Use the information for SpongeBob’s traits in the table to write the phenotype for each item.
LL-__Long nose___ Rr-___Round Eyes___
yy-_Blue Body_ ll- ___Stubby Nose_ Ss-__Squarepants__ ss- ___Roundpants_
RR - _Round Eyes_ Yy -___Yellow Body_ rr - __Oval Eyes__ Ll- _Long Nose_____
5. Use the information in the chart above to write the genotype(s) for each trait below.
Yellow body _____
Round pants_____
Oval eyes______
Long nose______
Blue body______
Round eyes_____
Square pants_____
Stubby nose_____
6. Determine the genotypes for each using the information in the chart above.
Heterozygous round eyes -_Rr_ Homozygous long nose - _LL__ Purebred squarepants - _SS__
7. SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous for his square shape, but SpongeSusie is round..
A. Create a Punnett square to show the possibilities that would result
if SpongeBob and SpongeSusie had children
B. What are the chances of a child with a square shape?
_2__ out of _4__ or _50_%
C. What are the chances of a child with a round shape?
_2__ out of _4__ or _50_%
8. Patrick met Patti at the dance. Both of them are heterozygous for their pink body color, which is dominant
over a yellow body color.
A. Create a Punnett square to show the possibilities that would
result if Patrick and Patti had children.
B. What are the chances of a child with a pink body?
_3_ out of _4__ or _75_%
C. What are the chances of a child with a yellow body?
_1__ out of __4_ or _25_%
9. One of SpongeBob’s cousins, SpongeBillyBob, recently met a cute squarepants gal, SpongeGerdy, at a local dance and fell in love. Use your knowledge of genetics to answer the questions below.
A. If SpongeGerdy’s father is a heterozygous squarepants and
her mother is a roundpants, what is her genotype? Complete
a Punnett square to show the possible genotypes that would
result to help you determine Gerdy’s genotype.
What is Gerdy’s genotype? __Ss___
B. SpongeBillyBob is heterozygous for his squarepants shape.
What is his genotype? __Ss___
C. Complete the Punnett square to show the possibilities that
would result if Billy Bob & Gerdy had children.
D. List the possible genotypes and phenotypes for the kids.
E. What is the probability of kids with squarepants? _75__ %
F. What is the probability of kids with roundpants? _25__ %