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 of the 5
questions.
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 Ho_______
Which of the genotypes in #1 would be hybrids? __________All 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_____
4. SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance.
SpongeBob is heterozygous for his square shape (Ss), but SpongeSusie is round (ss).
Create a Punnett square to show the possibilities that would result if SpongeBob and
SpongeSusie had children. HINT: Read question #2!
Ss x ss
s
s
S
Ss
Ss
s
ss
ss
A. List the possible genotypes and phenotypes for their children.
G: 50% Ss 50% ss
P: 50 % square
50% round
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_%
5. Patrick met Patti at the dance. Both of them are heterozygous (Pp x Pp) for their pink
body color, which is dominant over a yellow body color. Create a Punnett square to
show the possibilities that would result if Patrick and Patti had children. HINT: Read
question #3!
G: 25% PP
50% Pp
25% pp
P: 75 % pink
25% yellow
A. List the possible genotypes and phenotypes for their children.
B. What are the chances of a child with a pink body? _3 out of _1_ out of _4_ or
_25_%4 or _75_%
C. What are the chances of a child with a yellow body? _1_ out of _4_ or _25_%
P
p
P
PP
Pp
Worksheet created by T. Trimpe 2003 http://sciencespot.net/
p
Pp
pp