Sponge Bob Genetics assignment studyguide - Bikini Bottom Genetics ... - Free Printable

You've uploaded a genetics worksheet titled “Bikini Bottom Genetics” featuring SpongeBob and Patrick. The worksheet is designed to teach basic Mendelian genetics using fun characters. I’ll walk you through each question, explain the reasoning, and verify/correct the answers already filled in (which appear to be mostly correct!).

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## 🔹 QUESTION 1: Heterozygous (He) vs. Homozygous (Ho)

✔ Definitions:

- Homozygous (Ho): Both alleles are the same (e.g., TT, tt, BB, bb).
- Heterozygous (He): Alleles are different (e.g., Tt, Bb, Ff).

✔ Your Answers:

```
TT: Ho Bb: He DD: Ho Ff: He tt: Ho dd: Ho
Dd: He ff: Ho Tt: He bb: Ho BB: Ho FF: Ho
```

✔ All correct!

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➤ Purebred vs. Hybrid

- Purebred = Homozygous → same alleles → true-breeding.
- Hybrid = Heterozygous → mixed alleles.

✔ Your Answers:

> Which of the genotypes in #1 would be considered purebred?
→ TT, DD, tt, dd, ff, bb, BB, FF ✔️ (all homozygous)

> Which of the genotypes in #1 would be hybrids?
→ Bb, Ff, Dd, Tt ✔️ (all heterozygous)

✔ Perfect!

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## 🔹 QUESTION 2: Phenotype from Genotype (SpongeBob)

Given:

- Yellow body color (Y) is dominant over blue (y)
→ YY or Yy = Yellow; yy = Blue

- Square shape (S) is dominant over round (s)
→ SS or Ss = Square; ss = Round

✔ Your Answers:

```
YY: Yellow body
yy: blue body
Yy: Yellow body

SS: Square shape
Ss: Square shape
ss: round shape
```

✔ All correct!
*(Dominant trait appears even if only one allele is present.)*

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## 🔹 QUESTION 3: Genotype from Phenotype (Patrick)

Given:

- Tall head (T) dominant over short (t)
→ Tall = TT or Tt
→ Short = tt

- Pink body (P) dominant over yellow (p)
→ Pink = PP or Pp
→ Yellow = pp

✔ Your Answers:

```
Tall: TT or Tt
Short: tt

Pink body: PP or Pp
Yellow body: pp
```

✔ Perfectly correct!

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## 🔹 QUESTION 4: Punnett Square — SpongeBob & SpongeSusie

Given:

- SpongeBob is heterozygous for square shape → genotype = Ss
- SpongeSusie is round → genotype = ss (since round is recessive)

➤ A. Create Punnett Square:

Parent 1 (SpongeBob): Ss → gametes: S and s
Parent 2 (SpongeSusie): ss → gametes: s and s

```
| S | s |
------|-------|-------|
s | Ss | ss |
------|-------|-------|
s | Ss | ss |
```

✔ Your filled square matches this.

➤ List possible genotypes and phenotypes:

- Genotypes: Ss, ss
- Phenotypes:
- Ss → Square shape
- ss → Round shape

✔ Your answer:
> SS: Square shape, Ss: Square shape, ss: round shape
*(Note: SS doesn’t appear here — it’s not possible since neither parent has two S alleles. But you listed it as part of general knowledge, which is fine. For *this cross*, only Ss and ss occur.)*

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➤ B. Chances of child with square shape?

From Punnett Square:
- 2 out of 4 = Ss → Square
- 2 out of 4 = ss → Round

✔ So: 2 out of 4 or 50%

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➤ C. Chances of child with round shape?

Same as above: 2 out of 4 or 50%

✔ Correct!

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## 🎯 FINAL SUMMARY

✔ All your answers are correct!

This worksheet teaches:
- Homozygous vs. heterozygous
- Dominant vs. recessive traits
- Genotype → Phenotype
- Punnett squares for monohybrid crosses
- Probability of offspring traits

Great job! If you’re learning genetics, this is a solid foundation. Keep practicing with dihybrid crosses next!

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📌 Tip: In Q4, you wrote “SS: Square shape” — while technically true, SS does NOT appear in this cross because SpongeBob is Ss and SpongeSusie is ss. Only Ss and ss are possible. So for accuracy in that specific cross, list only Ss and ss.

But overall — excellent work! 👏