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What is the expected genotypic ratio of a dihybrid cross?

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Question: What is the expected genotypic ratio of a dihybrid cross?

Options:

  1. 1:1
  2. 3:1
  3. 9:3:3:1
  4. 1:2:1

Correct Answer: 9:3:3:1

Solution: 

The expected genotypic ratio of a dihybrid cross is 9:3:3:1, representing the combinations of two traits.

What is the expected genotypic ratio of a dihybrid cross?

Practice Questions

Q1
What is the expected genotypic ratio of a dihybrid cross?
  1. 1:1
  2. 3:1
  3. 9:3:3:1
  4. 1:2:1

Questions & Step-by-Step Solutions

What is the expected genotypic ratio of a dihybrid cross?
Correct Answer: 9:3:3:1
  • Step 1: Understand what a dihybrid cross is. It involves two traits, each with two alleles.
  • Step 2: Identify the alleles for each trait. For example, let's say Trait 1 has alleles A and a, and Trait 2 has alleles B and b.
  • Step 3: Create a Punnett square for the dihybrid cross. This will be a 4x4 grid because there are four combinations of alleles from each parent.
  • Step 4: Fill in the Punnett square with all possible combinations of the alleles from both traits.
  • Step 5: Count the different genotypes that appear in the Punnett square.
  • Step 6: Determine the ratio of each genotype. You will find 9 combinations of one type, 3 of another, 3 of a third type, and 1 of the last type.
  • Step 7: Write the expected genotypic ratio as 9:3:3:1.
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