Bikini Bottom - Dihybrid Practice Worksheet Template
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1
2Bikini Bottom – Dihybrid Practice
Name ________________________
Use the chart to identify the genotypes of the
Trait
Dominant Gene
Recessive Gene
following traits:
Body Shape
Squarepants (S)
Roundpants (s)
Body Color
Yellow (Y)
Blue (y)
1. Heterozygous round eyes, blue body ________
Eye Shape
Round (R)
Oval (r)
Nose Style
Long (L)
Stubby (l)
2. Hybrid eye shape, purebred roundpants ________
3. Purebred roundpants, heterozygous long nose ________
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 = ________
Fiancé – Purebred Squarepants, Long Nose = ________
5. What are the possible gamete combinations for each person? Aunt – ________ Fiancé – ________
6. What are the possible genotypes for their children? ______________________________________
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 = ________
SpongeSusie = ________
8. What are the possible gamete combinations for each person?
SpongeBob = ________________
SpongeSusie = ________
9. Complete the Punnett square based on the information provided in #7-8 and then answer the questions.
What is the chance of a blue baby? ________
What is the chance of a squarepants? ________
What is the chance of a blue squarepants? ________
What is the chance of a purebred recessive for both traits? ________
Contributed by Andrea Stonebraker
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