Determining Genotypes & Phenotypes for Dihybrid Cross

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).

Determine the genotype of a horse with the phenotype: curly maned pacer horse

• HhTT

• hhTT

• hhtt

• HHtt

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).

Determine the genotype of a horse with the phenotype: homozygous dominant for both traits

• HhTT

• HHTT

• hhtt

• HHtt

In horses, a straight mane (H) is dominant over a curly mane(h). Trotter horses (T) are dominant to pacer horses (t).

Determine the genotype of a horse with the phenotype: heterozygous for both traits

• HhTt

• HHTT

• hhtt

• HHtt

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).

Determine the phenotype of a flower with the genotype: Pprr

• Purple flower with wrinkled seeds

• Purple flower with round seeds

• White flower with wrinkled seeds

• White flower with round seeds

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).

Determine the phenotype of a flower with the genotype: ppRR

• Purple flower with wrinkled seeds

• Purple flower with round seeds

• White flower with wrinkled seeds

• White flower with round seeds

In pea plants, purple flowers (P) are dominant to white flower (p). Round seeds (R) are dominant to wrinkled seeds (r).

Determine the phenotype of a flower with the genotype: PpRr

• Purple flower with wrinkled seeds

• Purple flower with round seeds

• White flower with wrinkled seeds

• White flower with round seeds

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).

Determine the genotype of a guinea pig with the phenotype: short hair with black eyes (select all possible genotypes)

• HHBb

• hhbb

• HhBB

• HHbb

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).

Determine the genotype of a guinea pig with the phenotype: long hair with red eyes.

• HHBb

• hhbb

• hhBB

• HHbb

In guinea pigs, short hair (H) is dominant to long hair (h). Also, black eyes (B) are dominant to red eyes (b).

Determine the genotype of a guinea pig with the phenotype: short hair with red eyes (select all possible genotypes)

• HHbb

• Hhbb

• hhBB

• HHBb

In cocker spaniels, a black coat color (B) is dominant to brown coat color (b). Also, curly hair (C) is dominant to straight hair (c).

Determine the phenotype of a cocker spaniel with the genotype: BbCc

• heterozygous for coat color and hair texture

• homozygous black coat with straight hair

• heterozygous coat color with homozygous curly hair

• homozygous brown coat with homozygous curly hair