Dihybrid Cross Quiz

What is the phenotypic ratio resulting from a dihybrid cross between two heterozygous parents (AaBb x AaBb)?

• 9:3:3:1

• 3:1

• 1:2:1

• 1:1:1:1

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DOK Level 1: Recall

In a dihybrid cross, what does each letter in a Punnett square represent?

• A complete genotype

• A single allele

• A pair of chromosomes

• A phenotypic trait

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DOK Level 1: Recall

When constructing a Punnett square for a dihybrid cross, how many squares will the grid contain?

• 4

• 8

• 16

• 32

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DOK Level 2: Skill/Concept

If two parents are both heterozygous for two traits (AaBb), what is the probability of them producing an offspring with the genotype AABB?

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DOK Level 2: Skill/Concept

Which of the following best describes the purpose of using a Punnett square in a dihybrid cross?

• To predict the possible genotypes of offspring

• To determine the actual outcomes in future generations

• To confirm the phenotypes of the parents

• To calculate the exact number of offspring

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DOK Level 2: Skill/Concept

The Punnett square above illustrates a dihybrid cross for cats. The traits are long tail (s), short tail (S), brown hair (B), and white hair (b). What are the genotypes of the parents that produces the probabilities shown in the Punnett square above?

• A. Ssbb x ssBb

• B. Ssbb x SSBB

• C. SsBb x SsBb

• D. SSBb x SsBb

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-3

What is the phenotypic ratio of this dihybrird cross?

• 9:3:3:1
• 4:4:4:4