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In a genetic experiment, a plant with genotype AaBb is crossed with another plan

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Question: In a genetic experiment, a plant with genotype AaBb is crossed with another plant of genotype Aabb. What is the probability of obtaining an offspring with genotype Aabb?

Options:

  1. 1/4
  2. 1/2
  3. 3/4
  4. 1/8

Correct Answer: 1/2

Solution: 

The possible genotypes from the cross AaBb x Aabb are AaBb, Aabb, AABb, and Aabb. The probability of Aabb is 1/2.

In a genetic experiment, a plant with genotype AaBb is crossed with another plan

Practice Questions

Q1
In a genetic experiment, a plant with genotype AaBb is crossed with another plant of genotype Aabb. What is the probability of obtaining an offspring with genotype Aabb?
  1. 1/4
  2. 1/2
  3. 3/4
  4. 1/8

Questions & Step-by-Step Solutions

In a genetic experiment, a plant with genotype AaBb is crossed with another plant of genotype Aabb. What is the probability of obtaining an offspring with genotype Aabb?
  • Step 1: Identify the genotypes of the parent plants. The first plant has genotype AaBb and the second plant has genotype Aabb.
  • Step 2: Determine the possible gametes (sperm and egg) each parent can produce. The first plant (AaBb) can produce gametes AB, Ab, aB, and ab. The second plant (Aabb) can produce gametes Ab and ab.
  • Step 3: Create a Punnett square to visualize the possible combinations of the gametes from both parents.
  • Step 4: Fill in the Punnett square with the combinations of the gametes. The combinations will be: AaBb, Aabb, AaBb, Aabb.
  • Step 5: Count the total number of offspring genotypes. There are 4 total combinations: 2 AaBb and 2 Aabb.
  • Step 6: Calculate the probability of obtaining the genotype Aabb. There are 2 Aabb out of 4 total combinations, which simplifies to 1/2.
  • Punnett Square Analysis – Understanding how to use a Punnett square to determine the probabilities of offspring genotypes from a genetic cross.
  • Genotype Probability Calculation – Calculating the probability of specific genotypes resulting from a cross between two plants with known genotypes.
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