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

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

Options:

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

Correct Answer: 1:2:1

Solution: 

The expected genotypic ratio in the F2 generation of a monohybrid cross is 1:2:1, representing the homozygous dominant, heterozygous, and homozygous recessive genotypes.

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

Practice Questions

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

Questions & Step-by-Step Solutions

What is the expected genotypic ratio in the F2 generation of a monohybrid cross?
  • Step 1: Understand what a monohybrid cross is. It involves crossing two organisms that differ in one trait.
  • Step 2: Identify the parental generation (P generation) and their genotypes. For example, one parent might be homozygous dominant (AA) and the other homozygous recessive (aa).
  • Step 3: The first generation (F1) will all be heterozygous (Aa) because they inherit one allele from each parent.
  • Step 4: When the F1 generation (Aa) is crossed with itself (Aa), we set up a Punnett square to predict the offspring.
  • Step 5: Fill in the Punnett square. You will have four boxes representing the possible combinations of alleles: AA, Aa, Aa, and aa.
  • Step 6: Count the genotypes from the Punnett square. You will find 1 AA (homozygous dominant), 2 Aa (heterozygous), and 1 aa (homozygous recessive).
  • Step 7: Write the genotypic ratio based on your counts: 1 AA : 2 Aa : 1 aa.
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