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What is the expected genotypic ratio from a monohybrid cross between two heteroz
What is the expected genotypic ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?
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What is the expected genotypic ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?
1:2:1
3:1
9:3:3:1
1:1
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The expected genotypic ratio from a monohybrid cross of Aa x Aa is 1:2:1.
Questions & Step-by-step Solutions
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Q: What is the expected genotypic ratio from a monohybrid cross between two heterozygous parents (Aa x Aa)?
Solution:
The expected genotypic ratio from a monohybrid cross of Aa x Aa is 1:2:1.
Steps: 7
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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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