Question

1. everyone in squidward’s family has light blue skin, which is the dominant trait for body color in his hometown of squid valley. his family brags that they are a “purebred” line. he recently married a nice girl who has light green skin, which is a recessive trait. create a punnett square to show the possibilities that would result if squidward and his new bride had children. use b to represent the dominant gene and b to represent the recessive gene.

a. list the possible genotypes and phenotypes for their children.

b. what are the chances of a child with light blue skin? ____%

c. what are the chances of a child with light green skin? ____%

d. would squidward’s children still be considered purebreds? explain!

1. assume that one of squidward’s sons, who is heterozygous for the light blue body color, married a girl that was also heterozygous. create a punnett square to show the possibilities that would result if they had children.

a. list the possible genotypes and phenotypes for their children.

b. what are the chances of a child with light blue skin? ____%

c. what are the chances of a child with light green skin? ____%

1. mr. krabbs and his wife recently had a lil’ krabby, but it has not been a happy occasion for them. mrs. krabbs has been upset since she first saw her new baby who had short eyeballs. she claims that the hospital goofed and mixed up her baby with someone else’s baby. mr. krabbs is homozygous for his tall eyeballs, while his wife is heterozygous for her tall eyeballs. some members of her family have short eyes, which is the recessive trait. create a punnett square using t for the dominant gene and t for the recessive one.

a. list the possible genotypes and phenotypes for their children.

b. did the hospital make a mistake? explain your answer.

Explanation:

Problem 6

Step1: Identify parental genotypes

Squidward (purebred dominant): $BB$; Bride (recessive): $bb$

Step2: Set up Punnett Square

$$\begin{array}{c|cc} & B & B \\ \hline b & Bb & Bb \\ b & Bb & Bb \\ \end{array}$$

Step3: Determine genotypes/phenotypes

All offspring are $Bb$, showing dominant light blue skin.

Step4: Calculate trait probabilities

100% for light blue, 0% for light green.

Step5: Evaluate purebred status

Purebred = homozygous; offspring are heterozygous.

Step1: Identify parental genotypes

Both parents are heterozygous: $Bb$

Step2: Set up Punnett Square

$$\begin{array}{c|cc} & B & b \\ \hline B & BB & Bb \\ b & Bb & bb \\ \end{array}$$

Step3: List genotypes/phenotypes

Homozygous dominant ($BB$), heterozygous ($Bb$) = light blue skin; homozygous recessive ($bb$) = light green skin.

Step4: Calculate trait probabilities

$\frac{3}{4}$ = 75% for light blue; $\frac{1}{4}$ = 25% for light green.

Step1: Identify parental genotypes

Mr. Krabb (homozygous dominant): $TT$; Mrs. Krabb (heterozygous): $Tt$

Step2: Set up Punnett Square

$$\begin{array}{c|cc} & T & T \\ \hline T & TT & TT \\ t & Tt & Tt \\ \end{array}$$

Step3: Determine offspring traits

All offspring have at least one dominant $T$ allele, so all have tall eyeballs.

Step4: Evaluate hospital claim

No offspring can have short eyeballs ($tt$).

Answer:

A. Genotype: $Bb$; Phenotype: Light blue skin
B. 100
C. 0
D. No. All children have a heterozygous genotype ($Bb$), meaning they carry both dominant and recessive alleles, so they are not purebred (purebred organisms have homozygous genotypes, either $BB$ or $bb$).

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Problem 7