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If a plant with genotype AaBb is crossed with another AaBb plant, what fraction

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Question: If a plant with genotype AaBb is crossed with another AaBb plant, what fraction of the offspring will be homozygous recessive for both traits?

Options:

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

Correct Answer: 1/16

Solution: 

The fraction of offspring that are homozygous recessive (aabb) from the cross AaBb x AaBb is 1/16.

If a plant with genotype AaBb is crossed with another AaBb plant, what fraction

Practice Questions

Q1
If a plant with genotype AaBb is crossed with another AaBb plant, what fraction of the offspring will be homozygous recessive for both traits?
  1. 1/16
  2. 1/4
  3. 3/16
  4. 9/16

Questions & Step-by-Step Solutions

If a plant with genotype AaBb is crossed with another AaBb plant, what fraction of the offspring will be homozygous recessive for both traits?
Correct Answer: 1/16
  • Step 1: Identify the genotypes of the parent plants. Both plants are AaBb.
  • Step 2: Determine the possible gametes (sperm and egg) each parent can produce. Each parent can produce four types of gametes: AB, Ab, aB, and ab.
  • Step 3: Set up a Punnett square to visualize the cross. Create a 4x4 grid to represent the combinations of gametes from both parents.
  • Step 4: Fill in the Punnett square with the combinations of gametes. Each cell in the grid will represent a possible genotype of the offspring.
  • Step 5: Count the number of offspring that are homozygous recessive for both traits (aabb). Look for the combination 'aabb' in the Punnett square.
  • Step 6: Calculate the total number of offspring combinations. There are 16 total combinations in the Punnett square.
  • Step 7: Determine the fraction of offspring that are homozygous recessive (aabb). There is 1 'aabb' combination out of 16 total combinations.
  • Step 8: Write the fraction as 1/16.
  • Mendelian Genetics – Understanding how traits are inherited through dominant and recessive alleles using Punnett squares.
  • Genotype and Phenotype – Differentiating between homozygous and heterozygous genotypes and their implications for offspring traits.
  • Probability in Genetics – Calculating the probability of specific genotypes in offspring from parental crosses.
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