Question

1. everyone in squidwards 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 squidwards children still be considered purebreds? explain!

Explanation:

Step 1: Determine Genotypes of Parents

Squidward's family is "purebred" for light blue skin (dominant trait), so his genotype is \( BB \) (homozygous dominant). His bride has light green skin (recessive trait), so her genotype is \( bb \) (homozygous recessive).

Step 2: Set Up Punnett Square

• Squidward's alleles: \( B \) and \( B \) (top row of Punnett square).
• Bride's alleles: \( b \) and \( b \) (left column of Punnett square).

	\( B \)	\( B \)
\( b \)	\( Bb \)	\( Bb \)

Part A: Possible Genotypes and Phenotypes

• Genotypes: All offspring will have the genotype \( Bb \) (heterozygous).
• Phenotypes: Since \( B \) (light blue skin) is dominant, all children will have light blue skin.

Part B: Chances of Light Blue Skin

All 4 squares in the Punnett square show \( Bb \) (light blue skin). So the percentage is \( \frac{4}{4} \times 100 = 100\% \).

Part C: Chances of Light Green Skin

No squares show \( bb \) (light green skin). So the percentage is \( 0\% \).

Part D: Are Children Purebreds?

Purebred (homozygous) organisms have two identical alleles (e.g., \( BB \) or \( bb \)). Squidward’s children have the genotype \( Bb \) (heterozygous, two different alleles), so they are not purebreds.

Answer:

s:
A. Genotypes: All \( Bb \); Phenotypes: All light blue skin.
B. \( 100\% \)
C. \( 0\% \)
D. No, because their genotype is \( Bb \) (heterozygous, not purebred).