Bikini Bottom - Dihybrid Crosses Worksheet Template

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Bikini Bottom – Dihybrid Crosses
Name ________________________________
Use the chart to identify the genotypes of the following traits:
1. Heterozygous round eyes, blue body ________
Trait
Dominant Gene
Recessive Gene
Body Shape
Squarepants (S)
Roundpants (s)
Body Color
Yellow (Y)
Blue (y)
2. Hybrid eye shape, purebred roundpants ________
Eye Shape
Round (R)
Oval (r)
Nose Style
Long (L)
Stubby (l)
3. Purebred roundpants, heterozygous long nose ________
4. 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 is a hybrid for his long nose.
A. Identify the genotypes of the aunt and her fiancé.
Aunt = Roundpants, Stubby Nose = ________
Fiancé = Purebred Squarepants, Long Nose = ________
B. What are the possible gamete combinations for each person?
Aunt = ______________________________
Fiancé = ______________________________
C. What are the possible genotypes for their children? ______________________________________
5. As we know, SpongeBob is heterozygous for his yellow body color and his squarepants, while his wife
SpongeSusie is blue and has roundpants. Use this information to answer the following questions.
A. Give the genotypes for each.
SpongeBob = __________________
SpongeSusie = _______________
B. What are the possible gamete combinations for each person?
SpongeBob = __________________
SpongeSusie = __________________
C. Complete the Punnett square based on the information provided in #5.
____________
____________
____________
____________
____________
____________
____________
____________
D. Answer the questions based on your Punnett square.
What is the chance of a blue baby? _____
What is the chance of a blue squarepants? _____
What is the chance of a squarepants? _____
What is the chance of a purebred recessive for both traits? _____
Contributed by Andrea Stonebraker

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