Bikini Bottom Practice Genetics Worksheet With Answer Key
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1
2Name
Date
Period
Use the chart to identify the genotypes of the following traits:
1. Heterozygous round eyes, blue body
Rryy
2. Hybrid eye shape, purebred roundpants
Rrpp
3. Purebred roundpants, heterozygous long nose
ppLl
SpongeBob’s aunt, who is a roundpants, has a cute stubby nose. She has finally found the sponge of her dreams
and is ready to settle down. Her fiancé always comments on how adorable her nose is (he says it reminds him of his
mother’s – aww, how sweet!). They wonder what the chances are of that trait being passed on. Her fiancé is a
purebred squarepants and has purebred long nose.
4. Identify the genotypes of the aunt and her fiancé.
Aunt – Roundpants, Stubby Nose =
ppll
Fiancé – Purebred Squarepants, Long Nose =
PPLl (has to be heterozygous Ll because his mom has as stubby nose)
5. What are the possible gamete combinations for each person?
Aunt
pl only
Fiancé
Pl or PL
6. What are the possible genotypes for their children?
Ppll or PpLl
7. What are the genotypes of SpongeBob, who is heterozygous for his yellow body color and his
squarepants, and his wife SpongeSusie, who is blue and has roundpants?
SpongeBob =
YyPp
SpongeSusie =
yypp
8. What are the possible gamete combinations for each person?
SpongeBob =
YP Yp yP yp
SpongeSusie =
yp
9. Complete the Punnett square based on the information provided in #7-8 and then answer the
questions.
yp
What is the chance of a blue baby?
50% or ½
YP
YyPp
What is the chance of a squarepants?
50% or ½
Yp
Yypp
What is the chance of a blue squarepants?
25% or ¼
yP
yyPp
What is the chance of a purebred recessive for both traits?
25% or ¼
yp
yypp
10. In starfish, pink body color (P) is dominant to orange (p), and thick eyebrows (T) are dominant
over thin (t) ones. Patrick, who is heterozygous for body color but purebred for thick eyebrows, has
met Patti, who is recessive for both traits.
What is Patti’s
phenotype?pptt
Is it possible for the new couple to have offspring that resemble their mother? Explain.
It is possible for them to resemble their mother in color (half of them would be orange) but not in
eyebrows. None of them would look just like their mother.
11. Before Patrick commits to this relationship, he would like to guarantee that his offspring would
have his thick eyebrows. (He thinks they make him smarter!) You need to provide evidence for or against the
marriage. This question regards eyebrows ONLY.
Because Patrick is homozygous dominant for eyebrows, all of his offspring will have thick eyebrows regardless of
who the mother is.
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