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What is the expected phenotypic ratio in the F2 generation of a monohybrid cross

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Question: What is the expected phenotypic ratio in the F2 generation of a monohybrid cross?

Options:

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

Correct Answer: 3:1

Solution: 

In a monohybrid cross, the expected phenotypic ratio in the F2 generation is 3:1, where three offspring display the dominant trait and one displays the recessive trait.

What is the expected phenotypic ratio in the F2 generation of a monohybrid cross

Practice Questions

Q1
What is the expected phenotypic ratio in the F2 generation of a monohybrid cross?
  1. 3:1
  2. 1:2:1
  3. 9:3:3:1
  4. 1:1

Questions & Step-by-Step Solutions

What is the expected phenotypic ratio in the F2 generation of a monohybrid cross?
Correct Answer: 3:1
  • Step 1: Understand what a monohybrid cross is. It involves crossing two organisms that differ in one trait.
  • Step 2: Identify the dominant and recessive traits. The dominant trait is the one that appears in the offspring, while the recessive trait does not.
  • Step 3: In the F1 generation (first generation), all offspring will show the dominant trait because they inherit one dominant allele from each parent.
  • Step 4: When the F1 generation is crossed with itself, it produces the F2 generation (second generation).
  • Step 5: In the F2 generation, the offspring will show a mix of the dominant and recessive traits.
  • Step 6: The expected ratio of offspring showing the dominant trait to those showing the recessive trait is 3:1.
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