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If a plant with genotype Aa is crossed with another plant of genotype Aa, what i

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Question: If a plant with genotype Aa is crossed with another plant of genotype Aa, what is the probability of obtaining a homozygous dominant offspring?

Options:

  1. 0%
  2. 25%
  3. 50%
  4. 100%

Correct Answer: 25%

Solution: 

The cross Aa x Aa results in a 1/4 chance of AA (homozygous dominant), which is 25%.

If a plant with genotype Aa is crossed with another plant of genotype Aa, what i

Practice Questions

Q1
If a plant with genotype Aa is crossed with another plant of genotype Aa, what is the probability of obtaining a homozygous dominant offspring?
  1. 0%
  2. 25%
  3. 50%
  4. 100%

Questions & Step-by-Step Solutions

If a plant with genotype Aa is crossed with another plant of genotype Aa, what is the probability of obtaining a homozygous dominant offspring?
  • Step 1: Identify the genotypes of the parent plants. Both plants have the genotype Aa.
  • Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the parents.
  • Step 3: Fill in the Punnett square. The possible combinations from Aa x Aa are: AA, Aa, Aa, and aa.
  • Step 4: Count the number of homozygous dominant offspring (AA) in the Punnett square. There is 1 AA.
  • Step 5: Count the total number of offspring combinations in the Punnett square. There are 4 combinations (AA, Aa, Aa, aa).
  • Step 6: Calculate the probability of obtaining a homozygous dominant offspring (AA) by dividing the number of AA by the total combinations: 1/4.
  • Step 7: Convert the fraction to a percentage: 1/4 equals 25%.
  • Punnett Square – Understanding how to use a Punnett square to determine the genotypic ratios from a genetic cross.
  • Mendelian Genetics – Applying the principles of Mendelian inheritance to predict the probability of offspring genotypes.
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