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What is the expected genotypic ratio from a monohybrid cross between two heteroz

Practice Questions

Q1
What is the expected genotypic ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?
  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 from a monohybrid cross between two heterozygous parents (Aa x Aa)?
Correct Answer: 1:2:1
  • Step 1: Identify the genotypes of the parents. In this case, both parents are heterozygous, represented as Aa.
  • Step 2: Set up a Punnett square. Draw a 2x2 grid to represent the possible combinations of alleles from the parents.
  • Step 3: Write the alleles of one parent (Aa) across the top of the grid: A and a.
  • Step 4: Write the alleles of the other parent (Aa) along the side of the grid: A and a.
  • Step 5: Fill in the Punnett square by combining the alleles from the top and side. The combinations will be: AA, Aa, Aa, and aa.
  • Step 6: Count the genotypes from the filled Punnett square. You will have 1 AA, 2 Aa, and 1 aa.
  • Step 7: Write the genotypic ratio based on the counts: 1 AA : 2 Aa : 1 aa.
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