"Bikini Bottom Genetics worksheet for middle and high school students, using characters from SpongeBob SquarePants to teach genetics concepts."

Let’s go step by step through each question.

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Question 1: Identify each genotype as Heterozygous (He) or Homozygous (Ho)

Remember:
- Homozygous (Ho) = both alleles are the same (like BB or bb)
- Heterozygous (He) = alleles are different (like Bb)

So:

- Bb → different → He
- DD → same → Ho
- TT → same → Ho
- Ff → different → He
- dd → same → Ho
- Dd → different → He
- bb → same → Ho

✔ Done with Question 1.

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Question 2: SpongeBob’s body color — Yellow (Y) is dominant to blue (y)

Phenotype means what you see (the actual trait).

- YY → two dominant → Yellow
- Yy → one dominant, one recessive → still shows dominant → Yellow
- yy → two recessive → only then do you see blue → Blue

✔ Done with Question 2.

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Question 3: SpongeBob’s body shape — Square (S) is dominant to round (s)

Again, phenotype = what you see.

- SS → square
- Ss → square (because S is dominant)
- ss → round (only when no dominant allele)

✔ Done with Question 3.

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Question 4: Patrick’s traits

Patrick has:
- Tall head (T) → dominant over short (t)
- Pink body (g) → recessive to Green (G)

We need to write possible genotypes for his phenotypes.

→ He has a Tall head. Since T is dominant, he could be:
- TT (homozygous dominant) OR
- Tt (heterozygous)

→ He has a Pink body. Since pink is *recessive*, he MUST have two recessive alleles to show it. So only:
- gg

(If he had even one G, he’d be green.)

✔ Done with Question 4.

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Final Answer:

1.
Bb — He
DD — Ho
TT — Ho
Ff — He
dd — Ho
Dd — He
bb — Ho

2.
YY — Yellow
Yy — Yellow
yy — Blue

3.
SS — Square
Ss — Square
ss — Round

4.
Head height — TT or Tt
Body color — gg