bikini bottom genetics
name bella
scientists at bikini bottoms have been investigating the genetic makeup of the organisms in this community.
use the information provided and your knowledge of genetics to answer each question.
1. for each genotype below, indicate whether it is a heterozygous (he) or homozygous (ho).
tt ____ bb ____ dd ____ ff ____ tt ____ dd ____
dd ____ ff ____ tt ____ bb ____ bb ____ ff ____
which of the genotypes in #1 would be considered purebred? ____
which of the genotypes in #1 would be hybrids? ____
2. determine the phenotype for each genotype using the information provided about spongebob.
yellow body color is dominant to blue.
yy ____ yy ____ yy ____
square shape is dominant to round.
ss ____ ss ____ ss ____
3. for each phenotype, give the genotypes that are possible for patrick.
a tall head (t) is dominant to short (t).
tall = ____ short = ____
pink body color (p) is dominant to yellow (p).
pink body = ____ yellow body = ____
4. spongebob squarepants recently met spongesusie roundpants at a dance. spongebob is heterozygous for
his square shape, but spongesusie is round. create a punnett square to show the possibilities that would result
if spongebob and spongesusie had children. hint: read question #2!
a. list the possible genotypes and phenotypes for their children.
b. what are the chances of a child with a square shape? ____ out of ____ or ____%

Question

Accepted Answer

### Question 1
#### Step 1: Define Heterozygous (He) and Homozygous (Ho)
- Heterozygous: Genotype with two different alleles (e.g., Bb, Dd).
- Homozygous: Genotype with two identical alleles (e.g., TT, bb).

#### Step 2: Classify Each Genotype
- $ TT $: Ho (both alleles $ T $)
- $ Bb $: He (alleles $ B $ and $ b $)
- $ DD $: Ho (both alleles $ D $)
- $ Ff $: He (alleles $ F $ and $ f $)
- $ tt $: Ho (both alleles $ t $)
- $ dd $: Ho (both alleles $ d $)
- $ Dd $: He (alleles $ D $ and $ d $)
- $ ff $: Ho (both alleles $ f $)
- $ Tt $: He (alleles $ T $ and $ t $)
- $ bb $: Ho (both alleles $ b $)
- $ BB $: Ho (both alleles $ B $)
- $ FF $: Ho (both alleles $ F $)

#### Step 3: Identify Purebred (Homozygous) Genotypes
Purebred (homozygous) genotypes have identical alleles: $ TT, DD, tt, dd, ff, bb, BB, FF $.

#### Step 4: Identify Hybrid (Heterozygous) Genotypes
Hybrid (heterozygous) genotypes have different alleles: $ Bb, Ff, Dd, Tt $.

### Question 2
#### Step 1: Determine Phenotype from Genotype (Body Color)
- Yellow is dominant ($ Y $), blue is recessive ($ y $).
  - $ YY $: Yellow (homozygous dominant)
  - $ Yy $: Yellow (heterozygous, dominant allele expressed)
  - $ yy $: Blue (homozygous recessive)

#### Step 2: Determine Phenotype from Genotype (Shape)
- Square is dominant ($ S $), round is recessive ($ s $).
  - $ SS $: Square (homozygous dominant)
  - $ Ss $: Square (heterozygous, dominant allele expressed)
  - $ ss $: Round (homozygous recessive)

### Question 3
#### Step 1: Possible Genotypes for Tall Head (Dominant $ T $)
Tall head can be homozygous dominant ($ TT $) or heterozygous ($ Tt $) (since dominant allele $ T $ is present). Short head must be homozygous recessive ($ tt $) (only recessive allele $ t $ present).

#### Step 2: Possible Genotypes for Pink Body (Dominant $ P $)
Pink body can be homozygous dominant ($ PP $) or heterozygous ($ Pp $) (dominant allele $ P $ present). Yellow body must be homozygous recessive ($ pp $) (only recessive allele $ p $ present).

### Question 4
#### Step 1: Determine Parental Genotypes
- SpongeBob: Heterozygous for square shape ($ Ss $)
- SpongeSusie: Round shape ($ ss $) (recessive, so homozygous recessive)

#### Step 2: Create Punnett Square
|       | $ S $ | $ s $ |
|-------|-------|-------|
| $ s $ | $ Ss $ | $ ss $ |
| $ s $ | $ Ss $ | $ ss $ |

#### Step 3: Analyze Punnett Square
- **Genotypes**: $ Ss $ (50%) and $ ss $ (50%)
- **Phenotypes**: Square ($ Ss $) (50%) and Round ($ ss $) (50%)

### Final Answers

#### Question 1
- Heterozygous (He) / Homozygous (Ho):
  $ TT $: Ho; $ Bb $: He; $ DD $: Ho; $ Ff $: He; $ tt $: Ho; $ dd $: Ho; $ Dd $: He; $ ff $: Ho; $ Tt $: He; $ bb $: Ho; $ BB $: Ho; $ FF $: Ho
- Purebred (Homozygous): $ TT, DD, tt, dd, ff, bb, BB, FF $
- Hybrids (Heterozygous): $ Bb, Ff, Dd, Tt $

#### Question 2
- Body Color Phenotypes:
  $ YY $: Yellow; $ Yy $: Yellow; $ yy $: Blue
- Shape Phenotypes:
  $ SS $: Square; $ Ss $: Square; $ ss $: Round

#### Question 3
- Tall Head: $ TT, Tt $; Short Head: $ tt $
- Pink Body: $ PP, Pp $; Yellow Body: $ pp $

#### Question 4
- **A. Genotypes & Phenotypes**:
  Genotypes: $ Ss $ (square), $ ss $ (round)
  Phenotypes: 50% Square ($ Ss $), 50% Round ($ ss $)
- **B. Chances of Square Shape**: 2 out of 4 (or 50%)

QUESTION IMAGE

Question

Explanation:

Question 1

Step 1: Define Heterozygous (He) and Homozygous (Ho)

Step 2: Classify Each Genotype

Step 3: Identify Purebred (Homozygous) Genotypes

Step 4: Identify Hybrid (Heterozygous) Genotypes

Question 2

Step 1: Determine Phenotype from Genotype (Body Color)

Step 2: Determine Phenotype from Genotype (Shape)

Question 3

Step 1: Possible Genotypes for Tall Head (Dominant \( T \))

Step 2: Possible Genotypes for Pink Body (Dominant \( P \))

Question 4

Step 1: Determine Parental Genotypes

Step 2: Create Punnett Square

Step 3: Analyze Punnett Square

Final Answers

Question 1

Question 2

Question 3

Question 4

Answer:

Question 1

Step 1: Define Heterozygous (He) and Homozygous (Ho)

Step 2: Classify Each Genotype

Step 3: Identify Purebred (Homozygous) Genotypes

Step 4: Identify Hybrid (Heterozygous) Genotypes

Question 2

Step 1: Determine Phenotype from Genotype (Body Color)

Step 2: Determine Phenotype from Genotype (Shape)

Question 3

Step 1: Possible Genotypes for Tall Head (Dominant \( T \))

Step 2: Possible Genotypes for Pink Body (Dominant \( P \))

Question 4

Step 1: Determine Parental Genotypes

Step 2: Create Punnett Square

Step 3: Analyze Punnett Square

Final Answers

Question 1

Question 2

Question 3

Question 4