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In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what fractio

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Question: In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what fraction of the offspring will be homozygous recessive for both traits?

Options:

  1. 1/16
  2. 3/16
  3. 1/4
  4. 9/16

Correct Answer: 1/16

Solution: 

The probability of being homozygous recessive for both traits (aabb) in a dihybrid cross is 1/16.

In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what fractio

Practice Questions

Q1
In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what fraction of the offspring will be homozygous recessive for both traits?
  1. 1/16
  2. 3/16
  3. 1/4
  4. 9/16

Questions & Step-by-Step Solutions

In a dihybrid cross between two heterozygous parents (AaBb x AaBb), what fraction of the offspring will be homozygous recessive for both traits?
  • Step 1: Understand the parents' genotypes. Both parents are heterozygous for two traits, which means they have the genotype AaBb.
  • Step 2: Identify the possible gametes each parent can produce. Each parent can produce four types of gametes: AB, Ab, aB, and ab.
  • Step 3: Set up a Punnett square. Create a 4x4 grid to represent the combinations of the gametes from both parents.
  • Step 4: Fill in the Punnett square. Combine the gametes from each parent to fill in the squares. You will get 16 combinations in total.
  • Step 5: Identify the homozygous recessive genotype. The homozygous recessive genotype for both traits is aabb.
  • Step 6: Count the occurrences of aabb in the Punnett square. There is only 1 combination that results in aabb.
  • Step 7: Calculate the fraction. Since there are 16 total combinations and only 1 is aabb, the fraction is 1/16.
  • Dihybrid Cross – A genetic cross involving two traits, where each parent is heterozygous for both traits.
  • Punnett Square – A tool used to predict the genotypic and phenotypic ratios of offspring from a genetic cross.
  • Homozygous Recessive – An organism that has two copies of the recessive allele for a given trait.
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