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What is the expected phenotypic ratio in the offspring of a monohybrid cross?

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

Options:

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

Correct Answer: 3:1

Solution: 

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

What is the expected phenotypic ratio in the offspring of a monohybrid cross?

Practice Questions

Q1
What is the expected phenotypic ratio in the offspring of a monohybrid 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 phenotypic ratio in the offspring 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: Use a Punnett square to visualize the possible combinations of alleles from the parents.
  • Step 4: Count the number of offspring that show the dominant trait and the number that show the recessive trait.
  • Step 5: Calculate the ratio of dominant to recessive traits. In a typical monohybrid cross, you will find 3 showing the dominant trait for every 1 showing the recessive trait.
  • Step 6: Conclude that the expected phenotypic ratio in the offspring of a monohybrid cross is 3:1.
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